diff --git a/src/commandline.py b/src/commandline.py
index d681c146..ebc2bc5b 100644
--- a/src/commandline.py
+++ b/src/commandline.py
@@ -1,6 +1,8 @@
 # -*- coding: utf-8 -*-
 import argparse
+import sys
 import paths
+from StringIO import StringIO
 
 parser = argparse.ArgumentParser(description="TW Blue command line launcher")
 group = parser.add_mutually_exclusive_group()
@@ -8,7 +10,13 @@ group.add_argument("-p", "--portable", help="Use TW Blue as a portable aplicatio
 group.add_argument("-i", "--installed", help="Use TW Blue as an installed application. Config files will be saved on the user data directory", action="store_true")
 parser.add_argument("-d", "--data-directory", action="store", dest="directory", help="Specifies the directory where TW Blue saves the data files")
 args = parser.parse_args()
-if args.installed == True: paths.mode = "installed"
+if args.installed == True:
+ # Set a StringIO object as stdout and stderr to avoid problems using the installer.
+ sys.stdout = StringIO()
+ sys.stderr = StringIO()
+ paths.mode = "installed"
+ sys.stderr = open(paths.logs_path("stderr.log"), 'w')
+ sys.stdout = open(paths.logs_path("stdout.log"), 'w')
 elif args.portable == True:
  paths.mode = "portable"
  if args.directory != None: paths.directory = args.directory