iMac (21.5-inch, Mid 2011) Upgrade to El Capitan
According to the hardware specs, my iMac 12,1 is compatible with El Capitan, but when I try to download it from the app store, it says "This version of OS X 10.11 cannot be installed on this computer." The version I'm trying to download is 10.11.6. Can I get an earlier version of El Capitan for my iMac?