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Question: Unable to go from High Sierra to Sierra?

Hey All,


I upgraded to High Sierra when it came out. I'm running a late 2015 MBP with plenty of free space and 8GB of RAM.


HS is incompatible with one of my apps (Kerbal Space Program), so I decided to downgrade to Sierra, as per the instructions on How to download macOS Sierra - Apple Support. However, when I do that, the Mac App Store tells me "This copy of 'Install Mac OS' is too old to run". Suggestions? User uploaded file

MacBook Pro with Retina display, macOS High Sierra (10.13.2)

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Dec 16, 2017 10:30 AM in response to HondaRobb In response to HondaRobb

if you could boot into a previous system then you can do it. I have external drive with bootable operating system from Snow Leopard through High Sierra. Prepared for any emergency. This includes installers except for Snow Leopard which requires a darn CD.

Dec 16, 2017 10:30 AM

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Question: Unable to go from High Sierra to Sierra?