I've downloaded the DOS game from this site page and tryied to make it work. At first, I was stumped by a strange problem I never seen (the game just jump to the geoscape to the intro and back again), until I setted the sound with setup.exe (use soundblaster, all the default settings are already given to you) and started the game with UFOCD.bat.
The game is already fully installed in the archive, you don't have to install it again. I don't even think you could if you tryied anyways. All you need to do is unzip the archive, set the sound, start ufocd.bat and tweak a little with the cycles.
