diff --git a/.gitignore b/.gitignore
index 223f15a..6fc6cad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.swp
 Session.vim
-__pycache__
+__pycache__/
+*.py[cod]
diff --git a/__pycache__/pyf.cpython-35.pyc b/__pycache__/pyf.cpython-35.pyc
index e8039a8..3e79dd9 100644
Binary files a/__pycache__/pyf.cpython-35.pyc and b/__pycache__/pyf.cpython-35.pyc differ
diff --git a/pyf.py b/pyf.py
index 3159066..98ac5c3 100644
--- a/pyf.py
+++ b/pyf.py
@@ -4,6 +4,16 @@ import os
 WORKDIR = os.getcwd()
 
 
+
+TMP = '/tmp/quickos.log'
+def log(message):
+    ''' write to logfile TMP
+        @param message: the message which shall be written to the log file
+    '''
+    with open(TMP, 'a') as f:
+        f.write('{} {}\n'.format(time.ctime(), message))
+
+
 def prt(message):
     ''' print a message with style '''
     print('::: {}'.format(message))
@@ -18,7 +28,6 @@ def download(url, file_name, progress=True):
     if progress:
         from tqdm import tqdm
         prt('downloading {}'.format(url))
-        file_name = '{}/{}'.format(WORKDIR, url.split('/')[-1])
         class TqdmUpTo(tqdm):
             def update_to(self, b=1, bsize=1, tsize=None):
                 if tsize is not None:
diff --git a/quickos.py b/quickos.py
index dfa7997..0a264e4 100755
--- a/quickos.py
+++ b/quickos.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 
 
-
 from pprint import pprint
 import daemon
 import time
@@ -10,14 +9,10 @@ import os
 import json
 from pyf import download, prt
 
+
 WORKDIR = os.getcwd()
 
 
-
-TMP = '/tmp/quickos.log'
-
-
-
 def init_parser():
     ''' initialize the argument parser
         @return agrs: the parsed arguments
@@ -33,16 +28,6 @@ def init_parser():
     return parser.parse_args()
 
 
-
-def log(message):
-    ''' write to logfile TMP
-        @param message: the message which shall be written to the log file
-    '''
-    with open(TMP, 'a') as f:
-        f.write('{} {}\n'.format(time.ctime(), message))
-
-
-
 # algo check if new version should be downloaded
 # a: is image file there?
 # -> no: download image file
@@ -64,15 +49,19 @@ def check_update(database):
     ''' check if update is necessary '''
     from urllib.parse import urlparse
     from os import path
-    for name, ops in database.items():
+    for name, dist in database.items():
         prt('checking operating system {} ...'.format(name))
 
-        if ops['file_name'] == '':
-            file_name = urlparse(ops['file_url'])
+        if dist['file_name'] == '':
+            file_name = urlparse(dist['file_url'])
             file_name = file_name.path
-            file_name = path.basename(file_name)
-            print(file_name)
-            download(ops['file_url'], file_name)
+            file_name = '{}/dist/{}'.format(WORKDIR, path.basename(file_name))
+            download(dist['file_url'], file_name)
+            continue
+
+        file_name = '{}/dist/{}'.format(WORKDIR, dist['file_name'])
+        if not path.isfile(file_name):
+            download(dist['file_url'], file_name)
             continue