We have been progressively upgrading the MacMini 2 OS. An upgrade was installed and we tried to install the next upgrade but the MacMini does not recognise that the previous upgrade has been installed so we are stuck.
Does the user mean this computer ?
Has the computer been restarted since the initial upgrade and prior to attempting to install a subsequent next upgrade
To check if the first upgrade has been registers as being installed
In Finder >> Go >> Utilities >> System Information
Left Sidebar >> Software >> Installations
On the Right Panel check and see what version(s) of macOS have been successfully installed
In my listings, macOS 15.6.1 was successfully installed 2025-08-21 @ 03:43 AM
Mac mini 2 not recognising Mac OS upgrade
