I am still on Catalina and trying to upgrade to Big Sur and Software Update says that it is not available. What do I do?
I cannot update to Big Sur. Software Update says that it is not available.
iMac Line (2012 and Later)
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What model year is your iMac?
The model year of an iMac is available at Apple menu > About This Mac.
A late-2012 through late-2013 iMac can be upgraded to Catalina 10.15.7 but not to Big Sur.
A mid-2014 or later can be upgraded to the current version of Big Sur. See: https://support.apple.com/en-us/HT201475