Updating apps requires deceased husband's Apple ID
I have a situation where my client's husband set up her MacMini with his account. He has since deceased and she does not know his password. So now the iLife apps included with the MacMini (iPhoto, iMovie, etc.) as well as the purchased iWork suite will not update without her deceased husband's password, which she does not have.
Is there a way to transfer the ownership of these apps to her so that they can be updated? I've tried to help her but it seems like the App Store is stuck in a loop and won't allow her to change the Apple ID to her own. Any help you can provide would be most appreciated.
Mac mini, OS X Mountain Lion (10.8.4)