You can legally purchase and download Assassin's Creed IV Black Flag for PC from the following authorized retailers: Assassin's Creed® IV Black Flag™ on Steam
While searching for torrent downloads for Assassin's Creed IV Black Flag is common, it is important to know that downloading copyrighted games via torrent is illegal and can expose your PC to security risks like malware. The safest and most reliable way to download the game is through official digital storefronts. Official Purchase and Download Options download-assassins-creed-iv-black-flag-torrent-game-for-pc