“Needing a unit no higher OS than Yosemite - version 10.10. How do you tell exactly which OS is installed?”

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• This will come with an already installed on OS. It could be Mojave or Big Sur.

  Answered by Anonymous 2 years ago

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• You can downgrade macOS but it will require a complete wipe and a direct disk install of Yosemite. This can be performed at a third party computer repair location that services Apple Mac computers. This particular service is NOT I REPEAT NOT PROVIDED AT APPLE STORES EVER!

  Answered by macOS 2 years ago

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• Mine came with an already updated OS. I don't think you can downgrade the OS.

  Answered by Anonymous 3 years ago

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