Being prompted for an old iCloud ID when trying to update an app
The App Store is telling me I need to update an app. When I click update, it is prompting me for an old, no longer in use iCloud ID (that I suppose was the one I used when I first acquired this app). I don't remember the password for the old one. I tried signing out and then in again to iCloud on my Mac with my current iCloud ID, but got the same prompt. Any ideas? Thanks very much.
iMac, OS X Mountain Lion (10.8.5), iTunes 12.3