For Killing Floor 2 , this is particularly complex because many DLC weapons (like the Rhino revolvers or the Ion Thruster) are "cross-perked" and require server-side validation in online matches.
DLC unlockers for Killing Floor sit in a gray area that leans heavily toward “dangerous and unfair.” Tripwire has supported the game for years with free seasonal updates—if you love the game, buy the DLC when you can afford it. killing floor dlc unlocker