diff --git a/CHANGELOG b/CHANGELOG
index 53d387ed..5f1b5b0c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,12 @@
+Version 2.1.2-dev
+xx-12-2014
+
+[Feature] - Added checksum all repositories.
+
+[Updated] - Fix downloads modules.
+
 Version 2.1.1-dev
-02-12-2014
+01-12-2014
 
 [Feature] - Added options in /etc/slpkg/slpkg.conf file to select
             repositories.
diff --git a/PKG-INFO b/PKG-INFO
index 2cb9ac52..803baba6 100644
--- a/PKG-INFO
+++ b/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 1.1
 Name: slpkg
-Version: 2.1.1
+Version: 2.1.2
 Author: dslackw
 Author-email: d zlatanidis at gmail com
 Maintainer: dslackw
diff --git a/README.rst b/README.rst
index e2a8bd0c..b4977486 100644
--- a/README.rst
+++ b/README.rst
@@ -11,9 +11,9 @@
 
 Latest Release:
 
-- Version: 2.1.1
+- Version: 2.1.2
 - `Package <https://sourceforge.net/projects/slpkg/files/slpkg/binary/>`_
-- `Source <https://github.com/dslackw/slpkg/archive/v2.1.1.tar.gz>`_
+- `Source <https://github.com/dslackw/slpkg/archive/v2.1.2.tar.gz>`_
 - `CHANGELOG <https://github.com/dslackw/slpkg/blob/master/CHANGELOG>`_
  
 .. image:: https://raw.githubusercontent.com/dslackw/images/master/slpkg/logo.png
@@ -118,8 +118,8 @@ Untar the archive and run install.sh script:
 
 .. code-block:: bash
     
-    $ tar xvf slpkg-2.1.1.tar.gz
-    $ cd slpkg-2.1.1
+    $ tar xvf slpkg-2.1.2.tar.gz
+    $ cd slpkg-2.1.2
     $ ./install.sh
 
 From SourceForge:
@@ -196,7 +196,7 @@ Command Line Tool Usage
       -t, [repository] [package]                tracking dependencies
       -p, [repository] [package] --color=[]     print package description
       -f, [package]                             find installed packages
-      -n, [package]                             view packages from SBo
+      -n, [package]                             view SBo packages through network
       -i, [package...]                          install binary packages
       -u, [package...]                          upgrade binary packages
       -o, [package...]                          reinstall binary packages
diff --git a/install.sh b/install.sh
index 24c6ce00..f0a2b0ce 100755
--- a/install.sh
+++ b/install.sh
@@ -21,7 +21,7 @@
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 PRGNAM=slpkg
-VERSION=${VERSION:-2.1.1}
+VERSION=${VERSION:-2.1.2}
 TAG=${TAG:-_dsw}
 
 # Installation script.
diff --git a/man/slpkg.8 b/man/slpkg.8
index 65eb3b86..1bc2524f 100644
--- a/man/slpkg.8
+++ b/man/slpkg.8
@@ -49,7 +49,7 @@ Optional arguments:
   -t, [repository] [package]                tracking dependencies
   -p, [repository] [package] --color=[]     print package description
   -f, [package]                             find installed packages
-  -n, [package]                             view packages from SBo
+  -n, [package]                             view SBo packages through network
   -i, [package...]                          install binary packages
   -u, [package...]                          upgrade binary packages
   -o, [package...]                          reinstall binary packages
@@ -109,7 +109,8 @@ Check your packages is up to date.
 .PP
 Installs or upgrade packages from the repositories with automatically resolving all 
 dependencies of the package. Also installs the official distribution Slackware 
-packages.
+packages. Sometimes to install a package have to pass part of the version of the 
+package as 'slpkg -s alien ffmpeg-2.4.3'.
 
 .SS -t , tracking dependencies
 \fBslpkg\fP \fB-t\fP <\fIrepository\fP> <\fIname of package\fP>
diff --git a/slackbuild/slpkg.SlackBuild b/slackbuild/slpkg.SlackBuild
index 92da6606..be3458f1 100755
--- a/slackbuild/slpkg.SlackBuild
+++ b/slackbuild/slpkg.SlackBuild
@@ -23,7 +23,7 @@
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 PRGNAM=slpkg
-VERSION=${VERSION:-2.1.1}
+VERSION=${VERSION:-2.1.2}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_dsw}
 
diff --git a/slpkg/__metadata__.py b/slpkg/__metadata__.py
index 44107652..2e9524fa 100644
--- a/slpkg/__metadata__.py
+++ b/slpkg/__metadata__.py
@@ -26,7 +26,7 @@ import os
 
 __all__ = "slpkg"
 __author__ = "dslackw"
-__version_info__ = (2, 1, 1)
+__version_info__ = (2, 1, 2)
 __version__ = "{0}.{1}.{2}".format(*__version_info__)
 __license__ = "GNU General Public License v3 (GPLv3)"
 __email__ = "d.zlatanidis@gmail.com"
diff --git a/slpkg/arguments.py b/slpkg/arguments.py
old mode 100755
new mode 100644
index 5f08412a..ea669549
--- a/slpkg/arguments.py
+++ b/slpkg/arguments.py
@@ -24,7 +24,6 @@
 
 from __metadata__ import (
     __version__,
-    repositories
 )
 
 
@@ -53,7 +52,8 @@ def options():
         "  -t, [repository] [package]                tracking dependencies",
         "  -p, [repository] [package] --color=[]     print package description",
         "  -f, [package]                             find installed packages",
-        "  -n, [package]                             view packages from SBo",
+        "  -n, [package]                             view SBo packages "
+        "through network",
         "  -i, [package...]                          install binary packages",
         "  -u, [package...]                          upgrade binary packages",
         "  -o, [package...]                          reinstall binary packages",
@@ -79,10 +79,7 @@ def usage():
         "             [-p [repository] [package] --color=[]]",
         "             [-f] [-n] [-i [...]] [-u [...]]",
         "             [-o  [...]] [-r [...]] [-d [...]]\n",
-        "Repositories: " + ", ".join(repositories),
-        "Colors: red, green, yellow, cyan, grey\n",
-        "For more information try 'slpkg --help'\n"
+        "For more information try 'slpkg --help' or view manpage\n"
     ]
-
     for usg in view:
         print(usg)
diff --git a/slpkg/blacklist.py b/slpkg/blacklist.py
old mode 100755
new mode 100644
diff --git a/slpkg/checksum.py b/slpkg/checksum.py
old mode 100755
new mode 100644
index 29e575a5..44a18951
--- a/slpkg/checksum.py
+++ b/slpkg/checksum.py
@@ -22,12 +22,41 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 import hashlib
+import sys
+
+from messages import template
+from __metadata__ import (
+    color,
+    default_answer
+)
 
 
-def md5sum(source):
+def check_md5(pkg_md5, src_file):
     '''
-    Calculate packages md5 checksum
+    MD5 Checksum
     '''
-    with open(source) as file_to_check:
+    with open(src_file) as file_to_check:
         data = file_to_check.read()
-        return hashlib.md5(data).hexdigest()
+        md5 = hashlib.md5(data).hexdigest()
+    if pkg_md5 != md5:
+        template(78)
+        print("| MD5SUM check for {0} [ {1}FAILED{2} ]".format(
+            src_file.split("/")[-1], color['RED'], color['ENDC']))
+        template(78)
+        print("| Expected: {0}".format(md5))
+        print("| Found: {0}".format(pkg_md5))
+        template(78)
+        if default_answer == "y":
+            answer = default_answer
+        else:
+            answer = raw_input("Would you like to continue [Y/n]? ")
+        if answer in ['y', 'Y']:
+            print("")   # new line after answer
+        else:
+            sys.exit(0)
+    else:
+        template(78)
+        print("| MD5SUM check for {0} [ {1}PASSED{2} ]".format(
+            src_file.split("/")[-1], color['GREEN'], color['ENDC']))
+        template(78)
+        print("")   # new line after pass checksum
diff --git a/slpkg/config.py b/slpkg/config.py
old mode 100755
new mode 100644
diff --git a/slpkg/desc.py b/slpkg/desc.py
old mode 100755
new mode 100644
diff --git a/slpkg/downloader.py b/slpkg/downloader.py
old mode 100755
new mode 100644
index fb6de051..c7fe5d83
--- a/slpkg/downloader.py
+++ b/slpkg/downloader.py
@@ -32,20 +32,21 @@ class Download(object):
     def __init__(self, path, url):
         self.path = path
         self.url = url
-        self.file_name = self.url.split("/")[-1]
 
     def start(self):
         '''
         Download files usign wget.
-        Check if file already download the skip or continue
+        Check if file already download and skip or continue
         download if before stoped.
         '''
-        print("\n[ {0}Download{1} ] -->{1} {2}\n".format(color['GREEN'],
-                                                         color['ENDC'],
-                                                         self.file_name))
-        try:
-            subprocess.call("wget -c -N --directory-prefix={0} {1}".format(
-                            self.path, self.url), shell=True)
-        except KeyboardInterrupt:
-            print   # new line at cancel
-            sys.exit()
+        for dwn in self.url:
+            file_name = dwn.split("/")[-1]
+            print("\n[ {0}Download{1} ] -->{1} {2}\n".format(color['GREEN'],
+                                                             color['ENDC'],
+                                                             file_name))
+            try:
+                subprocess.call("wget -c -N --directory-prefix={0} {1}".format(
+                                self.path, dwn), shell=True)
+            except KeyboardInterrupt:
+                print   # new line at cancel
+                sys.exit(0)
diff --git a/slpkg/file_size.py b/slpkg/file_size.py
old mode 100755
new mode 100644
index 09f49abb..db686a55
--- a/slpkg/file_size.py
+++ b/slpkg/file_size.py
@@ -41,10 +41,10 @@ class FileSize(object):
             return int(meta.getheaders("Content-Length")[0])
         except (urllib2.URLError, IndexError):
             print("\nError: connection refused\n")
-            sys.exit()
+            sys.exit(0)
         except KeyboardInterrupt:
             print("")   # new line at cancel
-            sys.exit()
+            sys.exit(0)
 
     def local(self):
         '''
diff --git a/slpkg/others/download.py b/slpkg/grep_md5.py
old mode 100755
new mode 100644
similarity index 57%
rename from slpkg/others/download.py
rename to slpkg/grep_md5.py
index 9680bf9f..5b2d5e44
--- a/slpkg/others/download.py
+++ b/slpkg/grep_md5.py
@@ -1,7 +1,7 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
 
-# downloads.py file is part of slpkg.
+# grep_md5.py file is part of slpkg.
 
 # Copyright 2014 Dimitris Zlatanidis <d.zlatanidis@gmail.com>
 # All rights reserved.
@@ -21,13 +21,26 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
-from slpkg.downloader import Download
+
+from __metadata__ import lib_path
 
 
-def packages_dwn(path, links):
+def pkg_checksum(binary, repo):
     '''
-    Download patches
+    Return checksum from CHECKSUMS.md5 file by repository
     '''
-    for dwn in links:
-        Download(path, dwn).start()
-        Download(path, dwn + ".asc").start()
+    repos = {
+        'slack': 'slack_repo/CHECKSUMS.md5',
+        'rlw': 'rlw_repo/CHECKSUMS.md5',
+        'alien': 'alien_repo/CHECKSUMS.md5',
+        'slacky': 'slacky_repo/CHECKSUMS.md5',
+        'studio': 'studio_repo/CHECKSUMS.md5'
+    }
+    lib = repos[repo]
+    f = open(lib_path + lib, "r")
+    CHECKSUMS_md5 = f.read()
+    f.close()
+    for line in CHECKSUMS_md5.splitlines():
+        if line.endswith(binary):
+            md5 = line.split()[0]
+    return md5
diff --git a/slpkg/init.py b/slpkg/init.py
old mode 100755
new mode 100644
index 4cd5e92b..46d7c407
--- a/slpkg/init.py
+++ b/slpkg/init.py
@@ -65,6 +65,7 @@ class Initialization(object):
         log = log_path + "slack/"
         lib = lib_path + "slack_repo/"
         lib_file = "PACKAGES.TXT"
+        md5_file = "CHECKSUMS.md5"
         log_file = "ChangeLog.txt"
         version = slack_rel
         if not os.path.exists(log):
@@ -72,13 +73,20 @@ class Initialization(object):
         if not os.path.exists(lib):
             os.mkdir(lib)
         packages = mirrors(lib_file, "", version)
+        pkg_checksums = mirrors(md5_file, "", version)
         extra = mirrors(lib_file, "extra/", version)
+        ext_checksums = mirrors(md5_file, "extra/", version)
         pasture = mirrors(lib_file, "pasture/", version)
+        pas_checksums = mirrors(md5_file, "pasture/", version)
         packages_txt = ("{0} {1} {2}".format(packages, extra, pasture))
+        checksums_md5 = ("{0} {1} {2}".format(pkg_checksums, ext_checksums,
+                                              pas_checksums))
         changelog_txt = mirrors(log_file, "", version)
         self.write(lib, lib_file, packages_txt)
+        self.write(lib, md5_file, checksums_md5)
         self.write(log, log_file, changelog_txt)
-        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt)
+        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt,
+                    md5_file, checksums_md5)
 
     def sbo(self):
         '''
@@ -107,16 +115,20 @@ class Initialization(object):
         log = log_path + "rlw/"
         lib = lib_path + "rlw_repo/"
         lib_file = "PACKAGES.TXT"
+        md5_file = "CHECKSUMS.md5"
         log_file = "ChangeLog.txt"
         if not os.path.exists(log):
             os.mkdir(log)
         if not os.path.exists(lib):
             os.mkdir(lib)
         packages_txt = "{0}{1}/{2}".format(repo, slack_ver(), lib_file)
+        checksums_md5 = "{0}{1}/{2}".format(repo, slack_ver(), md5_file)
         changelog_txt = "{0}{1}/{2}".format(repo, slack_ver(), log_file)
         self.write(lib, lib_file, packages_txt)
+        self.write(lib, md5_file, checksums_md5)
         self.write(log, log_file, changelog_txt)
-        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt)
+        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt,
+                    md5_file, checksums_md5)
 
     def alien(self):
         '''
@@ -126,16 +138,20 @@ class Initialization(object):
         log = log_path + "alien/"
         lib = lib_path + "alien_repo/"
         lib_file = "PACKAGES.TXT"
+        md5_file = "CHECKSUMS.md5"
         log_file = "ChangeLog.txt"
         if not os.path.exists(log):
             os.mkdir(log)
         if not os.path.exists(lib):
             os.mkdir(lib)
         packages_txt = "{0}{1}".format(repo, lib_file)
+        checksums_md5 = "{0}{1}".format(repo, md5_file)
         changelog_txt = "{0}{1}".format(repo, log_file)
         self.write(lib, lib_file, packages_txt)
+        self.write(lib, md5_file, checksums_md5)
         self.write(log, log_file, changelog_txt)
-        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt)
+        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt,
+                    md5_file, checksums_md5)
 
     def slacky(self):
         '''
@@ -147,6 +163,7 @@ class Initialization(object):
         log = log_path + "slacky/"
         lib = lib_path + "slacky_repo/"
         lib_file = "PACKAGES.TXT"
+        md5_file = "CHECKSUMS.md5"
         log_file = "ChangeLog.txt"
         if not os.path.exists(log):
             os.mkdir(log)
@@ -156,11 +173,16 @@ class Initialization(object):
             ar = "64"
         packages_txt = "{0}slackware{1}-{2}/{3}".format(repo, ar, slack_ver(),
                                                         lib_file)
+        checksums_md5 = "{0}slackware{1}-{2}/{3}".format(repo, ar, slack_ver(),
+                                                         md5_file)
+
         changelog_txt = "{0}slackware{1}-{2}/{3}".format(repo, ar, slack_ver(),
                                                          log_file)
         self.write(lib, lib_file, packages_txt)
+        self.write(lib, md5_file, checksums_md5)
         self.write(log, log_file, changelog_txt)
-        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt)
+        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt,
+                    md5_file, checksums_md5)
 
     def studioware(self):
         '''
@@ -172,6 +194,7 @@ class Initialization(object):
         log = log_path + "studio/"
         lib = lib_path + "studio_repo/"
         lib_file = "PACKAGES.TXT"
+        md5_file = "CHECKSUMS.md5"
         log_file = "ChangeLog.txt"
         if not os.path.exists(log):
             os.mkdir(log)
@@ -181,27 +204,31 @@ class Initialization(object):
             ar = "64"
         packages_txt = "{0}slackware{1}-{2}/{3}".format(repo, ar, slack_ver(),
                                                         lib_file)
+        checksums_md5 = "{0}slackware{1}-{2}/{3}".format(repo, ar, slack_ver(),
+                                                         md5_file)
         changelog_txt = "{0}slackware{1}-{2}/{3}".format(repo, ar, slack_ver(),
                                                          log_file)
         self.write(lib, lib_file, packages_txt)
+        self.write(lib, md5_file, checksums_md5)
         self.write(log, log_file, changelog_txt)
-        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt)
+        self.remote(log, log_file, changelog_txt, lib, lib_file, packages_txt,
+                    md5_file, checksums_md5)
 
     @staticmethod
     def write(path, files, file_url):
         '''
         Write files in /var/lib/slpkg/?_repo directory
         '''
-        PACKAGES_TXT = ""
+        FILE_TXT = ""
         if not os.path.isfile(path + files):
             print("\nslpkg ...initialization")
             sys.stdout.write(files + " read ...")
             sys.stdout.flush()
             for fu in file_url.split():
-                PACKAGES_TXT += URL(fu).reading()
+                FILE_TXT += URL(fu).reading()
             sys.stdout.write("Done\n")
             with open("{0}{1}".format(path, files), "w") as f:
-                f.write(PACKAGES_TXT)
+                f.write(FILE_TXT)
                 f.close()
                 print("File {0} created in {1}".format(files, path))
 
@@ -210,7 +237,7 @@ class Initialization(object):
         '''
         args[0]=log, args[1]=log_file, arg[2]=changelog_txt
         args[3]=lib, args[4]=lib_file, arg[5]=packages_txt
-
+        args[6]=md5_file, args[7]=checksums_md5
         If the two files differ in size delete and replaced with new.
         We take the size of ChangeLog.txt from the server and locally
         '''
@@ -226,9 +253,13 @@ class Initialization(object):
             for fu in args[5].split():
                 PACKAGES_TXT += URL(fu).reading()
             CHANGELOG_TXT = URL(args[2]).reading()
+            CHECKSUMS_md5 = URL(args[7]).reading()
             with open("{0}{1}".format(args[3], args[4]), "w") as f:
                 f.write(PACKAGES_TXT)
                 f.close()
+            with open("{0}{1}".format(args[3], args[6]), "w") as f:
+                f.write(CHECKSUMS_md5)
+                f.close()
             with open("{0}{1}".format(args[0], args[1]), "w") as f:
                 f.write(CHANGELOG_TXT)
                 f.close()
diff --git a/slpkg/main.py b/slpkg/main.py
old mode 100755
new mode 100644
diff --git a/slpkg/messages.py b/slpkg/messages.py
old mode 100755
new mode 100644
index 3505d33f..08fb8d6a
--- a/slpkg/messages.py
+++ b/slpkg/messages.py
@@ -53,7 +53,7 @@ def s_user(user):
     '''
     if user != "root":
         print("\nslpkg: error: must have root privileges\n")
-        sys.exit()
+        sys.exit(0)
 
 
 def build_FAILED(sbo_url, prgnam):
diff --git a/slpkg/others/check.py b/slpkg/others/check.py
old mode 100755
new mode 100644
index 575c27b1..4f689d6b
--- a/slpkg/others/check.py
+++ b/slpkg/others/check.py
@@ -25,10 +25,14 @@ import os
 import sys
 
 from slpkg.sizes import units
+from slpkg.remove import delete
 from slpkg.repositories import Repo
 from slpkg.messages import template
+from slpkg.checksum import check_md5
 from slpkg.blacklist import BlackList
 from slpkg.init import Initialization
+from slpkg.downloader import Download
+from slpkg.grep_md5 import pkg_checksum
 from slpkg.splitting import split_package
 from slpkg.__metadata__ import (
     pkg_path,
@@ -40,11 +44,9 @@ from slpkg.__metadata__ import (
 
 from slpkg.pkg.manager import PackageManager
 
-from slpkg.slack.remove import delete
 from slpkg.slack.slack_version import slack_ver
 
 from greps import repo_data
-from download import packages_dwn
 
 
 class OthersUpgrade(object):
@@ -138,15 +140,15 @@ class OthersUpgrade(object):
                     answer = raw_input("\nWould you like to continue [Y/n]? ")
                 if answer in ['y', 'Y']:
                     upgrade_all.reverse()
-                    packages_dwn(self.tmp_path, dwn_links)
-                    upgrade(self.tmp_path, upgrade_all)
+                    Download(self.tmp_path, dwn_links).start()
+                    upgrade(self.tmp_path, upgrade_all, self.repo)
                     delete(self.tmp_path, upgrade_all)
             else:
                 print("No new updates in the repository '{0}'\n".format(
                     self.repo))
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
 
     def store(self):
         '''
@@ -228,12 +230,17 @@ def msgs(upgrade_all):
     return msg_pkg
 
 
-def upgrade(tmp_path, upgrade_all):
+def upgrade(tmp_path, upgrade_all, repo):
     '''
     Install or upgrade packages
     '''
     for pkg in upgrade_all:
         package = (tmp_path + pkg).split()
+        if repo == "alien":
+            check_md5(pkg_checksum("/" + slack_ver() + "/" + pkg, repo),
+                      tmp_path + pkg)
+        else:
+            check_md5(pkg_checksum(pkg, repo), tmp_path + pkg)
         print("[ {0}upgrading{1} ] --> {2}".format(color['YELLOW'],
                                                    color['ENDC'], pkg[:-4]))
         PackageManager(package).upgrade()
diff --git a/slpkg/others/dependency.py b/slpkg/others/dependency.py
old mode 100755
new mode 100644
index 4df4783b..d260f33d
--- a/slpkg/others/dependency.py
+++ b/slpkg/others/dependency.py
@@ -51,4 +51,4 @@ def dependencies_pkg(name, repo):
         return dep_results
     except KeyboardInterrupt:
         print("")   # new line at exit
-        sys.exit()
+        sys.exit(0)
diff --git a/slpkg/others/greps.py b/slpkg/others/greps.py
old mode 100755
new mode 100644
diff --git a/slpkg/others/install.py b/slpkg/others/install.py
old mode 100755
new mode 100644
index 4774734b..85406c9b
--- a/slpkg/others/install.py
+++ b/slpkg/others/install.py
@@ -25,9 +25,13 @@ import os
 import sys
 
 from slpkg.sizes import units
+from slpkg.remove import delete
 from slpkg.repositories import Repo
+from slpkg.checksum import check_md5
 from slpkg.init import Initialization
 from slpkg.blacklist import BlackList
+from slpkg.downloader import Download
+from slpkg.grep_md5 import pkg_checksum
 from slpkg.splitting import split_package
 from slpkg.messages import (
     pkg_not_found,
@@ -45,11 +49,9 @@ from slpkg.__metadata__ import (
 from slpkg.pkg.find import find_package
 from slpkg.pkg.manager import PackageManager
 
-from slpkg.slack.remove import delete
 from slpkg.slack.slack_version import slack_ver
 
 from greps import repo_data
-from download import packages_dwn
 from dependency import dependencies_pkg
 
 
@@ -159,8 +161,8 @@ class OthersInstall(object):
                                            "[Y/n]? ")
                     if answer in ['y', 'Y']:
                         install_all.reverse()
-                        packages_dwn(self.tmp_path, dwn_links)
-                        install(self.tmp_path, install_all)
+                        Download(self.tmp_path, dwn_links).start()
+                        install(self.tmp_path, install_all, self.repo)
                         write_deps(dependencies)
                         delete(self.tmp_path, install_all)
                 else:
@@ -178,7 +180,7 @@ class OthersInstall(object):
                 pkg_not_found("", self.package, "No matching", "\n")
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
 
     def store(self, deps):
         '''
@@ -271,12 +273,17 @@ def msgs(install_all, uni_sum):
     return [msg_pkg, msg_2_pkg]
 
 
-def install(tmp_path, install_all):
+def install(tmp_path, install_all, repo):
     '''
     Install or upgrade packages
     '''
     for install in install_all:
         package = (tmp_path + install).split()
+        if repo == "alien":
+            check_md5(pkg_checksum("/" + slack_ver() + "/" + install, repo),
+                      tmp_path + install)
+        else:
+            check_md5(pkg_checksum(install, repo), tmp_path + install)
         if os.path.isfile(pkg_path + install[:-4]):
             print("[ {0}reinstalling{1} ] --> {2}".format(color['GREEN'],
                                                           color['ENDC'],
diff --git a/slpkg/others/search.py b/slpkg/others/search.py
old mode 100755
new mode 100644
index 4849451c..4341fed2
--- a/slpkg/others/search.py
+++ b/slpkg/others/search.py
@@ -50,4 +50,4 @@ def search_pkg(name, repo):
                         return pkg_name
     except KeyboardInterrupt:
         print("")   # new line at exit
-        sys.exit()
+        sys.exit(0)
diff --git a/slpkg/pkg/build.py b/slpkg/pkg/build.py
old mode 100755
new mode 100644
index 16fc57a8..7ad2bb97
--- a/slpkg/pkg/build.py
+++ b/slpkg/pkg/build.py
@@ -29,17 +29,12 @@ import shutil
 import tarfile
 import subprocess
 
-from slpkg.checksum import md5sum
-from slpkg.messages import (
-    pkg_not_found,
-    template
-)
+from slpkg.checksum import check_md5
+from slpkg.messages import pkg_not_found
 from slpkg.__metadata__ import (
     log_path,
     sbo_build_log,
-    sbo_check_md5,
-    default_answer,
-    color
+    sbo_check_md5
 )
 
 from slpkg.sbo.greps import SBoGrep
@@ -106,38 +101,7 @@ class BuildPackage(object):
             pkg_not_found("\n", self.prgnam, "Wrong file", "\n")
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
-
-
-def check_md5(sbo_md5, src):
-    '''
-    MD5 Checksum
-    '''
-    md5 = md5sum(src)
-    if sbo_md5 != md5:
-        template(78)
-        print("| MD5SUM check for {0} [ {1}FAILED{2} ]".format(src,
-                                                               color['RED'],
-                                                               color['ENDC']))
-        template(78)
-        print("| Expected: {0}".format(md5))
-        print("| Found: {0}".format(sbo_md5))
-        template(78)
-        if default_answer == "y":
-            answer = default_answer
-        else:
-            answer = raw_input("Would you like to continue [Y/n]? ")
-        if answer in ['y', 'Y']:
-            pass
-        else:
-            sys.exit()
-    else:
-        template(78)
-        print("| MD5SUM check for {0} [ {1}PASSED{2} ]".format(src,
-                                                               color['GREEN'],
-                                                               color['ENDC']))
-        template(78)
-        print("")   # new line after pass checksum
+            sys.exit(0)
 
 
 def log_head(path, log_file, log_time):
diff --git a/slpkg/pkg/find.py b/slpkg/pkg/find.py
old mode 100755
new mode 100644
diff --git a/slpkg/pkg/manager.py b/slpkg/pkg/manager.py
old mode 100755
new mode 100644
index 0d82011d..0478c7e7
--- a/slpkg/pkg/manager.py
+++ b/slpkg/pkg/manager.py
@@ -116,7 +116,7 @@ class PackageManager(object):
                             str(len(removed)), msg))
             except KeyboardInterrupt:
                 print("")   # new line at exit
-                sys.exit()
+                sys.exit(0)
             if remove_pkg in ['y', 'Y']:
                 for rmv in removed:
                     # If package build and install with 'slpkg -s sbo <package>'
@@ -133,7 +133,7 @@ class PackageManager(object):
                                     "other packages) [Y/n]? ")
                         except KeyboardInterrupt:
                             print("")  # new line at exit
-                            sys.exit()
+                            sys.exit(0)
                         if remove_dep in ['y', 'Y']:
                             rmv_list += self.rmv_deps(self.binary,
                                                       dependencies,
@@ -316,4 +316,4 @@ class PackageManager(object):
             print("")   # new line at end
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
diff --git a/slpkg/queue.py b/slpkg/queue.py
old mode 100755
new mode 100644
diff --git a/slpkg/slack/remove.py b/slpkg/remove.py
old mode 100755
new mode 100644
similarity index 92%
rename from slpkg/slack/remove.py
rename to slpkg/remove.py
index cf172660..454be3df
--- a/slpkg/slack/remove.py
+++ b/slpkg/remove.py
@@ -23,7 +23,7 @@
 
 import os
 
-from slpkg.__metadata__ import del_all
+from __metadata__ import del_all
 
 
 def delete(path, packages):
@@ -33,4 +33,3 @@ def delete(path, packages):
     if del_all == "on":
         for pkg in packages:
             os.remove(path + pkg)
-            os.remove(path + pkg + ".asc")
diff --git a/slpkg/repositories.py b/slpkg/repositories.py
old mode 100755
new mode 100644
diff --git a/slpkg/sbo/check.py b/slpkg/sbo/check.py
old mode 100755
new mode 100644
index df4b0604..d814b93f
--- a/slpkg/sbo/check.py
+++ b/slpkg/sbo/check.py
@@ -105,8 +105,9 @@ class SBoCheck(object):
                             sbo_dwn = SBoLink(sbo_url).tar_gz()
                             src_dwn = SBoGrep(name).source().split()
                             script = sbo_dwn.split("/")[-1]
-                            Download(build_path, sbo_dwn).start()
-                            sources = dwn_sources(src_dwn)
+                            dwn_srcs = sbo_dwn.split() + src_dwn
+                            Download(build_path, dwn_srcs).start()
+                            sources = filenames(src_dwn)
                             BuildPackage(script, sources, build_path).build()
                             # Searches the package name and version in /tmp to
                             # install.If find two or more packages e.g. to build
@@ -116,7 +117,7 @@ class SBoCheck(object):
                                 binary = (tmp + max(binary_list)).split()
                             except ValueError:
                                 build_FAILED(sbo_url, prgnam)
-                                sys.exit()
+                                sys.exit(0)
                             if find_package(name + sp, pkg_path):
                                 print("[ {0}Upgrading{1} ] --> {2}".format(
                                     color['YELLOW'], color['ENDC'], name))
@@ -138,7 +139,7 @@ class SBoCheck(object):
                 print("\nNo SBo packages found\n")
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
 
     def sbo_list(self):
         '''
@@ -295,13 +296,12 @@ def view_packages(package_for_upgrade, upgrade_version, upgrade_arch):
     return [count_installed, count_upgraded], [msg_ins, msg_upg]
 
 
-def dwn_sources(sources):
+def filenames(sources):
     '''
     Download sources and return filenames
     '''
     filename = []
     for src in sources:
-        Download(build_path, src).start()
         filename.append(src.split("/")[-1])
     return filename
 
diff --git a/slpkg/sbo/compressed.py b/slpkg/sbo/compressed.py
old mode 100755
new mode 100644
diff --git a/slpkg/sbo/dependency.py b/slpkg/sbo/dependency.py
old mode 100755
new mode 100644
index 78d79286..27e7aab9
--- a/slpkg/sbo/dependency.py
+++ b/slpkg/sbo/dependency.py
@@ -55,4 +55,4 @@ def sbo_dependencies_pkg(name):
         return dep_results
     except KeyboardInterrupt:
         print("")   # new line at exit
-        sys.exit()
+        sys.exit(0)
diff --git a/slpkg/sbo/greps.py b/slpkg/sbo/greps.py
old mode 100755
new mode 100644
diff --git a/slpkg/sbo/read.py b/slpkg/sbo/read.py
old mode 100755
new mode 100644
diff --git a/slpkg/sbo/remove.py b/slpkg/sbo/remove.py
old mode 100755
new mode 100644
diff --git a/slpkg/sbo/search.py b/slpkg/sbo/search.py
old mode 100755
new mode 100644
index 4e5b196c..e7b4e2a5
--- a/slpkg/sbo/search.py
+++ b/slpkg/sbo/search.py
@@ -49,4 +49,4 @@ def sbo_search_pkg(name):
                         return (sbo_url + line[23:].strip() + "/")
     except KeyboardInterrupt:
         print("")   # new line at exit
-        sys.exit()
+        sys.exit(0)
diff --git a/slpkg/sbo/slackbuild.py b/slpkg/sbo/slackbuild.py
old mode 100755
new mode 100644
index 0d2d6925..2a68f570
--- a/slpkg/sbo/slackbuild.py
+++ b/slpkg/sbo/slackbuild.py
@@ -160,7 +160,7 @@ class SBoInstall(object):
                     pkg_not_found("\n", self.name, "No matching", "\n")
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
 
     def one_for_all(self):
         '''
@@ -302,7 +302,7 @@ def arch_support(source, support, package_sum, dependencies):
     return answer
 
 
-def dwn_sources(sources):
+def filenames(sources):
     '''
     Download sources and return filenames
     '''
@@ -310,7 +310,6 @@ def dwn_sources(sources):
     for src in sources:
         # get file from source
         filename.append(src.split("/")[-1])
-        Download(build_path, src).start()
     return filename
 
 
@@ -345,15 +344,16 @@ def build_install(dependencies, sbo_versions):
             sbo_link = SBoLink(sbo_url).tar_gz()
             src_link = SBoGrep(pkg).source().split()
             script = sbo_link.split("/")[-1]
-            Download(build_path, sbo_link).start()
-            sources = dwn_sources(src_link)
+            dwn_srcs = sbo_link.split() + src_link
+            Download(build_path, dwn_srcs).start()
+            sources = filenames(src_link)
             BuildPackage(script, sources, build_path).build()
             binary_list = search_in_tmp(prgnam)
             try:
                 binary = (tmp + max(binary_list)).split()
             except ValueError:
                 build_FAILED(sbo_url, prgnam)
-                sys.exit()
+                sys.exit(0)
             if find_package(pkg + sp, pkg_path):
                 print("{0}[ Upgrading ] --> {1}{2}".format(color['GREEN'],
                                                            color['ENDC'],
diff --git a/slpkg/sbo/views.py b/slpkg/sbo/views.py
old mode 100755
new mode 100644
index 211777c1..eedefd1c
--- a/slpkg/sbo/views.py
+++ b/slpkg/sbo/views.py
@@ -68,6 +68,7 @@ class SBoNetwork(object):
             self.sbo_req = grep.requires()
             self.sbo_dwn = SBoLink(self.sbo_url).tar_gz()
             self.sbo_version = grep.version()
+            self.dwn_srcs = self.sbo_dwn.split() + self.source_dwn
         self.space = ("\n" * 50)
         sys.stdout.write("{0}Done{1}\n".format(color['GREY'], color['ENDC']))
 
@@ -87,7 +88,7 @@ class SBoNetwork(object):
             while True:
                 choice = self.read_choice()
                 if choice in ['D', 'd']:
-                    self.download(path="")
+                    Download("", self.dwn_srcs).start()
                     break
                 elif choice in ['R', 'r']:
                     README = Read(self.sbo_url).readme("README")
@@ -183,7 +184,7 @@ class SBoNetwork(object):
                 color['GREY'], color['ENDC']))
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
         return choice
 
     def error_uns(self):
@@ -195,14 +196,6 @@ class SBoNetwork(object):
         if "".join(self.source_dwn) in UNST:
             return "".join(self.source_dwn)
 
-    def download(self, path):
-        '''
-        Download sources
-        '''
-        Download(path, self.sbo_dwn).start()
-        for src in self.source_dwn:
-            Download(path, src).start()
-
     def build(self, FAULT):
         '''
         Only build and create Slackware package
@@ -210,13 +203,12 @@ class SBoNetwork(object):
         if FAULT:
             print("\n{0}The package {1} {2}\n".format(color['RED'], FAULT,
                                                       color['ENDC']))
-            sys.exit()
+            sys.exit(0)
         sources = []
         os.chdir(build_path)
-        Download(build_path, self.sbo_dwn).start()
+        Download(build_path, self.dwn_srcs).start()
         script = self.sbo_dwn.split("/")[-1]
         for src in self.source_dwn:
-            Download(build_path, src).start()
             sources.append(src.split("/")[-1])
         BuildPackage(script, sources, build_path).build()
 
@@ -233,7 +225,7 @@ class SBoNetwork(object):
                 binary = (tmp + max(binary_list)).split()
             except ValueError:
                 build_FAILED(self.sbo_url, prgnam)
-                sys.exit()
+                sys.exit(0)
             print("[ {0}Installing{1} ] --> {2}".format(color['GREEN'],
                                                         color['ENDC'],
                                                         self.name))
diff --git a/slpkg/sizes.py b/slpkg/sizes.py
old mode 100755
new mode 100644
diff --git a/slpkg/slack/download.py b/slpkg/slack/download.py
deleted file mode 100755
index 4d1b42fe..00000000
--- a/slpkg/slack/download.py
+++ /dev/null
@@ -1,33 +0,0 @@
-#!/usr/bin/python
-# -*- coding: utf-8 -*-
-
-# downloads.py file is part of slpkg.
-
-# Copyright 2014 Dimitris Zlatanidis <d.zlatanidis@gmail.com>
-# All rights reserved.
-
-# Utility for easy management packages in Slackware
-
-# https://github.com/dslackw/slpkg
-
-# Slpkg is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-from slpkg.downloader import Download
-
-
-def slack_dwn(path, links):
-    '''
-    Download patches
-    '''
-    for dwn in links:
-        Download(path, dwn).start()
-        Download(path, dwn + ".asc").start()
diff --git a/slpkg/slack/greps.py b/slpkg/slack/greps.py
old mode 100755
new mode 100644
diff --git a/slpkg/slack/install.py b/slpkg/slack/install.py
old mode 100755
new mode 100644
index f7e5c436..de5f9ed6
--- a/slpkg/slack/install.py
+++ b/slpkg/slack/install.py
@@ -25,8 +25,12 @@ import os
 import sys
 
 from slpkg.sizes import units
+from slpkg.remove import delete
+from slpkg.checksum import check_md5
 from slpkg.blacklist import BlackList
 from slpkg.init import Initialization
+from slpkg.downloader import Download
+from slpkg.grep_md5 import pkg_checksum
 from slpkg.splitting import split_package
 from slpkg.messages import (
     pkg_not_found,
@@ -43,10 +47,8 @@ from slpkg.__metadata__ import (
 from slpkg.pkg.find import find_package
 from slpkg.pkg.manager import PackageManager
 
-from remove import delete
 from mirrors import mirrors
 from greps import slack_data
-from download import slack_dwn
 
 
 class Slack(object):
@@ -106,14 +108,14 @@ class Slack(object):
                 else:
                     answer = raw_input("\nWould you like to continue [Y/n]? ")
                 if answer in ['y', 'Y']:
-                    slack_dwn(self.tmp_path, dwn_links)
+                    Download(self.tmp_path, dwn_links).start()
                     install(self.tmp_path, install_all)
                     delete(self.tmp_path, install_all)
             else:
                 pkg_not_found("", self.slack_pkg, "No matching", "\n")
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
 
     def store(self):
         '''
@@ -177,6 +179,7 @@ def install(tmp_path, install_all):
     '''
     for install in install_all:
         package = (tmp_path + install).split()
+        check_md5(pkg_checksum(install, "slack"), tmp_path + install)
         if os.path.isfile(pkg_path + install[:-4]):
             print("[ {0}reinstalling{1} ] --> {2}".format(color['GREEN'],
                                                           color['ENDC'],
diff --git a/slpkg/slack/mirrors.py b/slpkg/slack/mirrors.py
old mode 100755
new mode 100644
diff --git a/slpkg/slack/patches.py b/slpkg/slack/patches.py
old mode 100755
new mode 100644
index 15f01915..60328283
--- a/slpkg/slack/patches.py
+++ b/slpkg/slack/patches.py
@@ -27,8 +27,12 @@ import subprocess
 
 from slpkg.sizes import units
 from slpkg.url_read import URL
+from slpkg.remove import delete
 from slpkg.messages import template
+from slpkg.checksum import check_md5
 from slpkg.blacklist import BlackList
+from slpkg.downloader import Download
+from slpkg.grep_md5 import pkg_checksum
 from slpkg.splitting import split_package
 from slpkg.__metadata__ import (
     pkg_path,
@@ -40,10 +44,8 @@ from slpkg.__metadata__ import (
 from slpkg.pkg.find import find_package
 from slpkg.pkg.manager import PackageManager
 
-from remove import delete
 from mirrors import mirrors
 from greps import slack_data
-from download import slack_dwn
 from slack_version import slack_ver
 
 
@@ -100,7 +102,7 @@ class Patches(object):
                 else:
                     answer = raw_input("\nWould you like to continue [Y/n]? ")
                 if answer in ['y', 'Y']:
-                    slack_dwn(self.patch_path, dwn_links)
+                    Download(self.patch_path, dwn_links).start()
                     upgrade(self.patch_path, upgrade_all)
                     kernel(upgrade_all)
                     delete(self.patch_path, upgrade_all)
@@ -112,7 +114,7 @@ class Patches(object):
                       "date\n".format(slack_arch, self.version, slack_ver()))
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
 
     def store(self):
         '''
@@ -163,6 +165,7 @@ def upgrade(patch_path, upgrade_all):
     Upgrade packages
     '''
     for pkg in upgrade_all:
+        check_md5(pkg_checksum(pkg, "slack"), patch_path + pkg)
         print("[ {0}upgrading{1} ] --> {2}".format(color['YELLOW'],
                                                    color['ENDC'], pkg[:-4]))
         PackageManager((patch_path + pkg).split()).upgrade()
diff --git a/slpkg/slack/slack_version.py b/slpkg/slack/slack_version.py
old mode 100755
new mode 100644
diff --git a/slpkg/splitting.py b/slpkg/splitting.py
old mode 100755
new mode 100644
diff --git a/slpkg/toolbar.py b/slpkg/toolbar.py
old mode 100755
new mode 100644
diff --git a/slpkg/tracking.py b/slpkg/tracking.py
old mode 100755
new mode 100644
diff --git a/slpkg/url_read.py b/slpkg/url_read.py
old mode 100755
new mode 100644
index 1d08bf7a..9ff3bac2
--- a/slpkg/url_read.py
+++ b/slpkg/url_read.py
@@ -39,7 +39,7 @@ class URL(object):
             return f.read()
         except (urllib2.URLError, ValueError):
             print("\nslpkg: error: connection refused\n")
-            sys.exit()
+            sys.exit(0)
         except KeyboardInterrupt:
             print("")   # new line at exit
-            sys.exit()
+            sys.exit(0)
diff --git a/slpkg/version.py b/slpkg/version.py
old mode 100755
new mode 100644