I’m getting a report from a user that the Mac App Store doesn’t work on macOS Sierra 10.12.6 anymore – they get “An unexpected error occurred while signing in.”
I also see these threads in the the Apple Support Community:
Apple made changes to Mac App Store receipts on January 24, 2025.
Looks like with this change they have also rendered the Mac App Store unusable on older systems, so that customers on these systems can no longer download their purchased apps.
I’m not sure whether there’s actually a connection between the receipts change and the store itself not working, but I can confirm that the store is broken on macOS 10.14 but works on macOS 10.15. On earlier versions, when I try to sign in it doesn’t report an error but never actually signs me in. Thus, you can browse the store but can’t make new purchases, re-download old ones, or install updates.
Previously:
