No problem mate. Here's a link.
http://www.miserymod.com/
It is a completely different experience. You will approach everything differently. It's the only Stalker I've played where I really just want to live in the world, as opposed to move the story forward. But it's pretty hardcore. And at the beginning, very difficult.
But as I said, it's very close to what I envision the Stalker world to be. Everything is much more deadly, scarce and bleak.