Buying Remastered will give you the original on GOG too, but unfortunately they both have problems. The original is more stable, but requires external fixes for things like FOV and audio balance and has issues running on a modern OS. Remastered is good to go out of the box, but WILL crash. I was lucky and got through with only two crashes, once with a large number of security bots on screen at once, and once during the final sequences where you're pushing through hordes of enemies who are also fighting each other. Seems to be tied to how much is going on at once, but there's no performance dip beforehand, it just goes from running perfectly to CTD, so I'm not sure. Still an excellent game, it's just a real shame both versions are so flawed now.
