Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

iMac just upgraded Catalina the other day

But surprisingly today a new OS Big Sur is downloading. Is Big Sur a new OS?

iMac 21.5″, macOS 10.15

Posted on Nov 15, 2020 9:20 AM

Reply
Question marked as Apple recommended

Big Sur is a new OS indeed. After download is finished, stop the installation and backup you Mac first, eg by using TimeMachine. Afterwards, look at the App folder and install Big Sur if you want to

Posted on Nov 15, 2020 9:35 AM

3 replies

iMac just upgraded Catalina the other day

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple ID.