iMac mid 2011, no Mohave upgrade
Why can't I upgrade my iOS?
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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
Why can't I upgrade my iOS?
Specifically, Mojave requires a graphics technology, Metal, that cannot be retro-fitted to 2011 and earlier iMacs.
iMac mid 2011, no Mohave upgrade