Plutonium

FragsAreUs i dont need to lie about this, its goes like this, we downloaded t6, i logged in and could play without a problem. He tried to open the plutonium.exe and acess denied message showed up, we tried moving the folder from drive E: to Documents, still same error. I noticed that his plutonim.exe had 3,7mbs, while mine had 4, so i sent him mine thinking that maybe windows defender blocked something. Worked, he could initiate plutoniom. He created an account, and tried to log in, but it couldn't authenticate, so on the first account he acctualy received the 130 day ban. We thought that it was a bug, so we tried to log in again on the same account, but same thing and the ban got bigger. We tried to create a new account but same thing pops up and the account got banned too, i dont need to lie, all this was happening while i was trying to figure it out with him, and he sharing he's screen, so i could follow him and try to guide him, its our first time downloading plutonium and we dont need to lie about anything. Im here seeking help, cuz i dont know what can be causing this

Its like this, my friend just creates an account, try to log in and the game cant authenticate, just like that he gets like, 130 day ban. Trying to solve this cuz its the first time we are downloading plutonium and i cant solve this myself. What should he do?