what is highest os for imac 21.5" mid 2011 currently running OS X 10.11.6
What is highest os for imac 21.5" mid 2011 currently running OS X El Capitan v10.11.6 ? Apple Menu Software Update does not show a new update available.
iMac 21.5″, OS X 10.11
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A 2011 iMac can run up to 10.13.6, you can get it by clicking How to get old versions of macOS - Apple Support