GTA Vice City Ultimate 2021 is a third-party fan mod available via GTA Mod Mafia that upgrades the 2002 game with high-definition textures, modern car models, and improved visual effects. This unofficial, non-standalone package requires a base installation of the original game and carries potential security risks, necessitating a thorough antivirus scan before installation. For more, read the article at gtamodmafia.com.