I have an early 2008 Mac Pro. Serial G882550TXYK 2 x 2.8 GHz Quad-Core Intel Xeon - Am I unable to upgrade to High Sierra
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High Sierra and Early 2008 Mac Pro Compatibilty
- Thread starter jrmosley18
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Apple only supports a max OS of El Capitan (10.11.6) for the early 2008 Mac Pro. The Apple App Store High Sierra install app will not run on your Mac Pro.