There is no official PC version of . The game was released exclusively for PlayStation 3 and Xbox 360 in 2012. Because the publisher, THQ, went bankrupt and the UFC license moved to EA, the game has been delisted from digital stores and will never receive an official PC port.
Any site asking you to complete a survey to unlock the download.
Because there is no native PC version, any file labeled as a "PC Torrent" for this game is likely a scam, a virus, or a repackaged emulator. Here is the safest way to play it on your computer today: The Safe Way to Play on PC UFC Undisputed 3