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[cosmogreen32]

Well, you probably DO know that this is a mission pack, so it requires original game (Sin). Since the original is not abandonware, you can write this one off. And mission packs and game expansions are a bit harder to find in stores then originals, especially when the game isn't a top notch. Witch Sin certainly isn't: a few months after Half Life came out using the same engine (quake 2) and everyone forgot about this crappy piece of money extraction software.