Can't update GarageBand because it's tied to old nonexistent email address!
W.T.F.? I get a notice from the App Store to update GarageBand. I attempt to update it but I am denied. Why? Notice says that GarageBand is not associated with my current AppleID but an another AppleID that is no longer valid nor does it exist. I have and use GarageBand on my current and only MacBookPro so W.T.F.? How do I update GarageBand?
MacBook Pro Retina (2015 and later)