Cannot play multiplayer
I can´t play, it always disconnect me from the server and my pc screen gets dark.
Do I must have the base game purchased? I haven´t got it.
now I can´t join any party, it says that VPN´s are not allowed.
Selected servers right? That's the fault of a server administration tool (IW4MA) that most servers use and for some reason your IP's getting flagged. Contact the server owners/admins of that server so they can whitelist your IP.