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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)

Posted on


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?