Upgrading macOS
I have macOS High Sierra but cannot seem to find a way to upgrade my OS beyond 10.13.6. Is it possible that my mac OS no longer upgradable?
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Back up your data, check your applications for compatibility, and if your Mac is a 2012 or newer model, or a 2010 desktop Mac Pro upgraded with a Metal-capable graphics card, download Mojave, Catalina, or Big Sur. Otherwise, it can't be upgraded further.
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