KSP loads forever in Mac OS

[Captainchemist]

I have a stock version of KSP 1.2.1 with Mac OS Sierra 10.12.2. When I double click the KSP executable, it loads but the loading takes ages. I've let this go for over 30 minutes and I can see stuff is progressing but nothing is happening. I played this on my computer about a year ago with no issues so I can't tell if it is a problem with the OS or KSP. Has anyone run into this?

[JPLRepo]

Hi @Captainchemist.

Yes this is a known issue with OSX Sierra.
There are a number of threads already and you can work around the problem.
Basically:
OSX Sierra GateKeeper will quarantine any downloaded app. It randomly moves the files to a temp folder when you run it.
This causes problems for KSP and Unity apps.
By copying the folder permissions are changed and the quarantine removed. and then moving them back again. You can then execute the app.
Same goes for downloaded mods.

So what you do is copy the folder say onto your desktop and then move it back to Applications again - should fix it.