This download is a self extracting installer including all you need to host and play Exterminatus - Rival Species 2. Two Species: Humans and Tyranids. Thirteen distinct classes, each with their own weapons. Nine maps from the 41st millennium, each with their own missions and objectives. version 8.50b features a new version ex_fortress, fixes for exploits on several maps and corrections of audio bugs that slipped in to the previous alpha.