MacOS – Change apple ID associated with Mac App Store application

It depends upon the app. For example, I've been able to replace the icon of djay (bought it in the MAS) with the one from Cyberduck, and djay launches just fine (except it's got a rubber duck as its icon now :-))

If the developer does an integrity check at start time, you're out of luck.

All app downloaded from Mac AppStore(MAS) contain a receipt inside their app bundle (example: appname.app/Contents/_MASReceipt/receipt). MAS will scan this file to check whether the new version is available.

You can use this application (Find Any File) to search any receipt on your drive: http://apps.tempel.org/FindAnyFile/

1. Launch 'Find Any File' and search for: _MASReceipt
2. Go through each result that you think could be the culprit, copy the receipt to your desktop as a backup, and after that delete the receipt inside _MASReceipt folder.
3. Open MAS and let it scan for software update. If it's still showing the wrong ID, it means that you've deleted the wrong receipt. Restore the receipt backup from your desktop to it's previous location.
4. Repeat the process until you've found the problem receipt.