PixelCrunch wrote:Is there some sort of thing i have to do to activate it (eg. certain button presses, ect.)
Also, how do i check if my gfx card can handle shaders?
You just told us straight up that your card can't handle newer versions of GZDoom.
I don't know how to explain it in a way that you can understand - but unfortunately, the shader only works if you're able to run the newer versions. It'll run just fine for everyone who can run those newer versions, though.
The hardware requirements for running this shader are the same as they are for the newer versions of GZDoom.