Factory reset 2012 10.8.5 won't upgrade/update
since purchase, I had rcvd all the updates. Since it had been a while after getting the catalina update, computer became slow, I decided to do a factory reset.
Its back to mountain lion 10.8.5 which the unit originally shipped with. However I can't seem to update anymore the os?
If I try to "get" catalina, it gives an error msg. Anyone who solved it, pls help. Using 10.8.5 today is crazy!
iMac 21.5″, macOS 10.15