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I have 2017 Mac desktop with Yosemite 10.10.5.
What can I version can I update to - and how?
Please and thank you.
Are you sure it is a 2017 Mac? Yosemite was from 2014 and would not run on a 2017 Mac.
You can check the model year at Apple menu > About This Mac.
Can't update Mac OS software on desktop computerYosemite 10.10.5
