STALKER Clear Sky Error

[hyperhammy]

I don't know if this is the right forum but this, but maybe you can help.
I just bought stalker clear sky because of the upcoming complete mod.
I tried to launch it. It crashes after the splash screen and tells me there was an xray engine error. Authentication problem with xr_Render_R2.dll.
Did anyone else have this error? If you need more information just ask.

 

[hyperhammy]

Okay, I got it to work. I edited fsgame.ltx with notepad to turn off direct x 10 and changed the renderer from 2.5 to 3