Why Can't I Upgrade?
Since when can I no longer update my Mac? I had a MacBook (original, not Pro) for over 10 years and was able to pay for the new software. With my "new" Mac (refurb from 2015) I'm at MacOS High Sierra (10.13.6) and need to upgrade because some apps are no longer compatible. I'm assuming my machine is "older", but its still very powerful, so what's the big deal? I'd pay for the new OS version, if only it were available.
iMac 27″, macOS 10.13