update programs installed by other user (other appleID)
I had the same problem, and it worked: Apple App Store: Grayed out Aapple Id Explained - Valiant:


  
  Go to the app listed in the App Store as needing an update (usually in the /Applications folder).
  Right click the app then click “Show Package Contents”.
  Go into the “Contents” folder, then into the “_MASReceipt” folder.
  Delete the “receipt” file (you may need to enter a local administrator 5. username and password).
  Please note that the app will still work as intended.