Question: Unable to go from High Sierra to Sierra?
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?
MacBook Pro with Retina display, macOS High Sierra (10.13.2)