Upgrade Question: iMac (Retina 5K, 27-inch, Late 2014) with Catalina OS
Can I upgrade to Mojave and Big Sur? My computer works perfectly, but I didn't want to take a chance in case the upgrade causes issues. Thanks for your help!
Not sure what you mean by "upgrade to Mojave and Big Sur" -- those aretwo different operating systems. You can upgrade from Catalina to Big Sur. A mid 2014 and late 2014 can be upgraded to the latest version of Big Sur macOS 11 but no later. See: How to get old versions of macOS - Apple Support