If you have a standard ISO, you can often "uncensor" it yourself using dedicated tools:
: This version is widely considered the best way to play Manhunt 2 today. It feels natively designed for the PSP’s smaller screen, and short level lengths make it ideal for quick sessions. Censorship in videogames: the Manhunt 2 case - Juantífico manhunt 2 psp usa iso uncensored repack