Those who had the issue it wouldn't start, if run it as admin didn't work you can re-install it again, if you have the game installed it might uninstall it with the launcher so i believe copy/pastes should work around that.
I've tried that, and a multitude of other things, and found something very strange.
If I create another admin account, the launcher works perfectly and I get into SC. On my "normal" admin account created as part of the machine first setup - it doesn't work at all. So either it's not a "real" admin account, or SC's folder privileges are closed to "that" admin account for some reason. Copying the same 30 gig folder to another machine, and it works with every account. My desktop machine has the original SC folder that I copied, which also works with every account. Bizarre. At least it works.