Install two versions of same app

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Anyone have info on how to customize an app that can install alongside another with the same name? For example customizing an old version of an app to install it alongside the new version.

The following thread popped up when creating this one: http://forum.xda-developers.com/showthread.php?t=816111

I have unpacked and modified every instance of the com.publisher.appname string I can find in the plain text files ("search all open files" in Notepad++ is an awesome tool). It repacks up just fine, but when I install it force closes.

I don't have my gtab with me, so I can't check on what it says in logcat during the FC, but I will soon and update the post.

Can anyone shed some light on this? Is this even possible without the APP source?

UPDATE: Possibly answering my own question... I found comments on this (http://stackoverflow.com/questions/1...f-the-same-app) useful. Working on a new version of the app in question now.


EDIT: I suppose this question might belong in the APPS section.