Upgrade to MacOS 10.14.0

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, click on Mojave, Catalina, or Big Sur. Otherwise, you can't.

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MacOSDJB wrote:

Are you saying my Mac is not capable of upgrading to Microsoft Office 365 Family?

If you don't have a 2012 or later Mac, that's correct.

Apple Menu > About This Mac.