The game was released by Activision, but after some disputes with Paramount (represented by Viacom) they returned the license for Star Trek games in general. For this reason, Bridge Commander and the other Star Trek games from Activision are no longer distributed. Therefore the game is not available at GOG or other retailers. Therefore, only the used trade remains, e. g. via eBay or Amazon Market Place.
The game is from 2002, therefore it is also designed for and will run on XP. Under Windows 7 x64 and also Win 10 the game runs without special handling. It is also easy to copy as a folder, so it does not have to be installed from CD to play.