The pro_shocktroops.zip file you have requested: Skins / Player / Skin Packs / Shock Troops - 1.77mb is not available. Perhaps try browsing all files for the game Soldier of Fortune II and upload any files you want to share or are missing. This is the only information we could locate:
This is a bit more than just a skin pack. I guess you could call it a "character pack". By altering the NPC files for the Prometheus guys, five entirely new characters have been created, with new bolt-ons and models.