To get a Mature (M) rating in the US, Rockstar implemented the “Rockstar Editor Filter”—a post-production blurring effect that obscures the most gruesome kills. The AO version was never officially released on any console.
However, the interest in the Manhunt 2 PKG goes beyond simple preservation. It is the vessel containing the code that modders hope to manipulate to restore the game's censored content. manhunt 2 pkg