File checksum (MD5): 4f8a2b1c9d3e5f7a8b0c1d2e3f4a5b6c
Follow these instructions carefully. If you mess up the file structure, the game will crash on launch.
Start I.G.I.-2 as usual. Load any mission (try "Mission 3: Trainyard" for fun). Press the Spacebar to jump. You will immediately notice the difference.