macOS Catalina
When I try to update to mac OS Catalina on my iMac (21.5-inch, Late 2013) I keep getting the "Unknown Error" message. I know that's a vague description, but Any suggestions?
iMac 21.5", OS X 10.10
Question marked as
By chance is there any antivirus, cleaning or any other types of third party maintenance apps installed on the computer?
Also, have you tried booting into Safe Mode per the directions in Safe Mode Reset instructions