Previously, AppSync got downloaded automatically along with Installous from the Hackulo repo. But now as the repo does not exist any more, you can download AppSync for iOS 6 by following these easy steps:
1. Open Cydia and add the following repo/source – http://repocydia.com
2. After the packages and releases have been updated, search for “AppSync for iOS 6” and install it.
3. Restart your springboard and connect your Apple device to your PC.
Now you can easily transfer .ipa files from your PC to your iPhone/iPad/iPod using iTunes or iFunBox
