Update to macOS 10.14.
I currently have macOS High Sierra version 10.13.6. I have been trying to update to 10.14. without success. Please advise. I keep getting messages that state I need to have 10.14. before I install any new versions.
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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, click on Mojave. Otherwise, you can't.
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