Nuu what happened to the link?! It seems that the whole website is down for a 404. I bet it'll be back soon enough. Use my profile avatar as a ref for now.
As for the install, try to run %appdata% -> Minecraft -> bin -> find the Minecraft.jar file and open it as a zip file. Find an image named char.png (sometimes in the "mob" folder), if you change this image with the downloaded skin, that should be it.