Thank you for the support, i fixed the problem with the help of some staff from the discord server and i put some of my own effort in the process. the game now works flawlessly.

Is he using Steam files or our torrent?
What is his antivirus?

TheBigGoomba101 try to let it load for some minutes if you have a slow disk.
Otherwise you can try this

Make sure your game is closed before doing that.
Go to %localappdata%\Plutonium\storage\t4\players
Open the config file with the notepad to edit it.
plutonium.cfg is for singleplayer/zombies and plutonium_mp.cfg is for multiplayer
Change these 4 dvars to be like below (you can use ctrl+f to search for them)

seta r_fullscreen "0" seta r_noborder "1" seta vid_xpos "0" seta vid_ypos "0"

If this still doesn't work then show how the mod is installed, the folder and its content, show everything.
Also are you using your Steam files?

cool cool. thanks for the info.

i was in a vc and figured it out lol, sorry for bothering you

we did that already you can see him following me and im following him i cant join him tho

windows defender but im sure its not the cause cuz i disabled it before installing the plutonium launcher and for the game

Pickxtt did you find a solution??

Make sure the game path isn't too big or doesn't have any special characters in it.

Lux's Husband We are aware of the Steam WAW situation, but the clients we create are intended to support MP and ZM only. We don't support the campaign because of lack of interest in the campaign mode.

AAAUUUGGGHHH Only thing Plutonium does is delete steam_api.dll from your game folder, that's probably causing it. You can verify integrity of files and it'd launch again. You could try making a copy of your steam t4 folder then use that for Plutonium, so your original files remain untouched.

I have the Same problem
so please, When u find a solution ,, Tell me.

did u find a fix ?

This is not plutonium issue the map dev should fix the bug

Fr13nd1yH0st try repairing T4 installation? It might help.