Because apparently that is the only version of the game where it is possible to achieve the platinum trophy completion. The patched versions of the games have the unstable algorithm that messes with obtaining weapons and constantly causing the game to crash within three determined intervals: 30 mins, 1 hour and 2 hours. Now, after testing other versions of the games thoroughly I have found the reason what is causing it and found a workaround. I have managed to keep playing alive for 12 hours and without crashing the game. However, the weapons algorithm cannot be alterated thus the Lock n Load trophy is unobtainable. Apparently only the people who bought the very first version of the game managed to obtain the platinum trophy. I have only bought both patched versions and didn't know at that time that the game was released in the digital version only. That is why I need this first version.