I have an imac still on catalina. (imac 21.5 2013). How do I upgrade the OS to at least Big Sur?
Need to upgrade OS from Catalina 10.15.7
iMac 21.5″, macOS 10.15
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A late 2013 iMac can be upgraded to Catalina 10.15.7 but no later. Also see the following from Identify your iMac model - Apple Support
iMac (21.5-inch, Late 2013)
Model Identifier: iMac14,1
Part Number: ME086xx/A, ME087xx/A
Latest compatible operating system: macOS Catalina 10.15.7