Hello! Blue Screen is a problem we're currently having for some users, I push a lot of updates, frequently, trying to fix it. I pushed an update 5 minutes ago, let me know how it goes. Don't worry, time will be compensated once it's fixed for everyone.
As for the Aimbot & Freecam, you need to right click on the [K] (not just click) to open a prompt and then you left click on the "Select Key" and press the key you want to use. After that, you just have to hold the key in game to toggle.
