Okay, I downloaded KSP 0.21.1 on Steam and when I start the game and go to the VAB or anywhere else actually, the loading asset appears, then it looses texture so it just says Loading and then the screen starts flashing between black, white and the game picture. If I'm in window the window flashes active and inactive and sometime minimizes. A few moments later the game crashes. I think it's the RAM. I don't have a good computer at all, it's a horrible laptop, but weirdly enough older versions of KSP like 0.18 and 0.19 work. I have 2GB ram, 1.5 available, AMD Hudson-Zacate E450 processor and an integrated GPU.
The game is stock. I'll try to upload a crash log, but I deleted them yesterday when this happened because I got mad at KSP for not working.