Unable to update Garage Band
Old apple ID has been deleted but garage band update [10.1.6 to 10.2] will not work with new apple ID .
[unable to backpeddle to old ID]
Correct 'device' [iMac 27"] and serial no appear in app store.
[tried deleting device/ reinstalling on appstore prefs but did not work]
GarageBand 10, OS X El Capitan (10.11.6)