When trying to upgrade from High Sierra ver 10.13.6 to Catalina, I was advised my computer is not upgradable.
Why is my IMAC not able to upgrade to Catalina? It is a Mac 27 in Mid 2011 with I5 and 16 GB of ram
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Catalina can only be installed on 2012 or later iMacs. See compatibility section of How to upgrade to macOS Catalina - Apple Support
High Sierra is the last version supported on a 2011 iMac.
