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Trouble upgrading iMac (27", mid 2011) to High Sierra

I am trying to upgrade my iMac (27", mid 2011) currently running 10.11.6 (El Capitan) to High Sierra 10.13.6.

All information I can find tells me I can do this but when I go into my software updates it does not show it.


I have downloaded 10.13.6 but when I click it to install it tells me I need 10.13. Do I need to upgrade to Sierra before upgrading to High Sierra?


I can't find 10.13.

Earlier Mac models

Posted on Oct 15, 2023 11:39 AM

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Posted on Oct 15, 2023 11:48 AM

You should be able to upgrade directly to 10.13.6. See the options described in How to download and install macOS - Apple Support


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Trouble upgrading iMac (27", mid 2011) to High Sierra

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