So. I started to have this problem. I'm running Windows 10 64bit and I figured that if the game had a 64 bit option, it would auto-run it. I don't think it is as I'm getting the same crashes as everyone else after the game only uses 48% of available memory (I have 16GB). Using the 64-bit version of the game launcher (ksp_x64.exe) solved the problem nicely