For anyone else landing here after 2020, take a look at Kerbal Adjustable Mod Panel (Kamp). It lets you turn mod buttons on and off in each environment (VAB, in flight, in map mode, etc). use
Same here. I haven't played in a couple of weeks - and everything was fine. Today I try to launch KSP and get the "KSP.app" missing error (running on Windows 11). And, it launches fine directly without Steam. But I like to stream it from my main desktop to a different computer through Steam, so hoping to get it running correctly again.