If you're looking for a product activation code for Manhunt 2 on PC, I recommend purchasing the game from a reputable online store, such as Steam or Rockstar Games. These platforms typically provide a legitimate product key or code as part of the purchase process.
sometimes list the "Amazon Download" version. This version was originally sold on Amazon and Direct2Drive and typically includes an online activation code. Physical Retail (Import) Manhunt 2 Product Activation Code Pc