Wondering this as well, cannot seem to find any local file that, when removed, affects my rank in a way that would result in it resetting back to 1 upon new files being generated. Makes me think there isn't actually any local file that stores information about your rank, and that it's handled server-side, which would be immensely disappointing. Tried removing my entire "players" folder from Plutonium, and all files from the "demonware" folder in storage, where I read the save data is supposedly held, yet in both cases, I still somehow loaded in at the exact same level I was before. Something isn't right there. If there is a local file that holds data about your multiplayer stats, then nobody seems to know where on God's green Earth it is located.

fixed it , Just restart your PC after Download. (FIXED : fixed it , Just restart your PC after Download.)

how do we change our NAT type

Found the solution:
First copy the game files out of the game folder (like copying all the files from the "Call of Duty Black Ops II" folder while keeping the folder there) to a new folder somewhere else. Then copy the plutonium.exe file into the game's folder. Rename it to whatever the multiplayer exe's name was. For BO2 you'd rename the file to "t6mp.exe." Then launch the game from Steam and it'll launch Plutonium. Select the folder where you copied the game files and it will work, recording your playtime.

Zakariadu78200 I was able to start the match.
To set the player limit over 4, type this into the consoe: "sv_maxclients (number of party members)"
To start the game type in: "xpartygo"

HumanError001 we don't provide game files and don't allow piracy discussions

This was caused by my Audient Evo 4 audio interface being plugged in. Though, this isn't a proper solution. Unplugging the thing I used to output to my speakers to play the game is not the correct way to go about thing. This wasn't an issue a couple of months ago the last time I played BO2 on Pluto..

Did you ever find a fix for this? I'm having the same issue

roxers Steam provides them.

Change the language of it in Steam.