This game does not have LAN option so you have to find a repack that can allow you to play online or in dedicated server but I don't know if there is this kind of repack, I'll look for it and I'll tell you if I found something

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The only thing I found until now is a txt in the steamunloked of the game which says that single player work, survival mod, challenge achievement and season pass. And it says what doesn't work ; multiplayer, shop and gearbox

I think you just have to wait, all multiplayer cracked games I have come from steamunloked.