Upgrade to Big Sur
I've tried twice to install Big Sur. I downloaded it, hit "continue", etc. and then it restarts and the progress bar goes a 1/4" and then stops. It stays this way for hours until I shut down the computer and start again. I have the latest version of Catalina on my 2017, 27" iMac. Any ideas why my computer freezes and refuses to update? Thanks.
iMac 27″ 5K, macOS 10.15