Finally, the time has come.

To have all the game files you should get the original game before playing Ufo: The Two Sides. However the game will not need the extractor to run (like demo did). You can play the game straight away without the need to extract graphics from the original. If you do, you won’t have any sound in game, and some graphics will be missing, but it will be playable. In other words, you can play ufo:tts without ufo1, if you can live with silent game and some blank graphics.