If you have downloaded a fix or unlocker file like Prototype.2.Radnet.Edition.zip , follow these general steps found in community guides from Steam and Reddit :
Unlocks various cosmetic skins, including the iconic Alex Mercer skin rewarded for completing all Radnet sets. File: Prototype.2.Radnet.Edition.zip ...
Competitive score-based trials and weekly themed rewards. Mutations: Exclusive upgrades for James Heller. If you have downloaded a fix or unlocker file like Prototype