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?
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I tried to upgrade my late 2015 iMAC running Mojave to Big Sur? The App Store says "unavailable?
Did you download the installer from here: How to get old versions of macOS - Apple Support
Did you download the installer from here: How to get old versions of macOS - Apple Support
How to perform a Mac OS Upgrade from Mojave to Big Sur