Alright, then. I'll make it easier for you. Look at the URL, strip it off http://www. and anything after / and itself and there you are. If you still can't figure it out, it's http://igg-games.com
Mount the iso on a drive, install it, open the iso file with 7zip or winrar, there's an exe Crashday inside, move it to the game directory and replace the existing exe (I know it's late but whatever)
If you still can't figure it out, it's http://igg-games.com