How to perform a Mac OS Upgrade from Mojave to Big Sur

I tried to upgrade my late 2015 iMAC running Mojave to Big Sur? The App Store says "unavailable?

Posted on Jan 25, 2022 03:31 PM

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Barney-15E

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Posted on Jan 25, 2022 05:48 PM

Did you download the installer from here: How to get old versions of macOS - Apple Support

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Barney-15E

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Jan 25, 2022 05:48 PM in response to fletchek508

Did you download the installer from here: How to get old versions of macOS - Apple Support

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How to perform a Mac OS Upgrade from Mojave to Big Sur

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