The update is waht is necessary, you have to wait and let the launcher update everything, which the first time it can take a while, until it the Multiplayer button gets black (from grey text, to black), then you click on the Singleplayer one, but you needed those updates. Then start the campaign again (this one is already compromised/bugged, just delete it, you did nothing anyway...). If it does the same error, then close the firewall (the antivirus shouldn't matter, but if it still doesn't wor…