Hi Quinn, It is a standard Mac app and is only distributed via the Mac App Store. Thanks! //Ray

Hi Eskimo, This is entirely new to TestFlight builds. I've done numerous updates for the past 10 years without issue via the Mac App Store. Also, as mentioned, doing a Developer ID build from the same archive will properly update the Mac App Store version. That is, won't prompt for keychain access. Any ideas? I do have a support request in as well, FYI. Thanks! //Ray

Thanks! Glad to know it's not just me.