Reinstalling Numbers on Mac OS X Numbers was installed with a different Apple ID to mine (my bosses), so it won't let me update it (when it prompts for credentials, you can't overwrite the user name). I therefore need to reinstall it using my Apple ID.

I dragged it from Applications to the trash then restarted the App Store. However, it still insists there's an update (which prompts me for my bosses credentials again). I've tried all the tricks I can find to tell the App Store to refresh:


⌘+R
turning on debug mode and telling it to reset
deleting the download cache


Nothing has worked.

How do I blow Numbers away and reinstall it using my own credentials?
For Apple's "free" apps, such as Numbers, I've had success doing the following:


Leave Numbers.app in the /Applications folder
Start App Store, and check for updates.  This should show an update for Numbers, but do not try to update it yet.
Move Numbers.app/Contents/_MASReceipt/receipt to your Desktop
Go back to the App Store, and update Numbers


This will download the new version, and create a new receipt file, with your new ownership credentials.

NOTE: This may not work if your second set of credentials is not already authorized to download Numbers via a different Mac, etc.