Heroes 5: Tribes of the East

Hello, I already asked the first part of this question, but I haven't found a solution yet. But I have some more ideas. 1. The problem itself. I bought Heroes 5 on Steam, downloaded it from there, launched it, and couldn't play online. Because an error pops up: "The game server has disconnected." This happens both when creating a game and when connecting. After searching the internet, I came to the conclusion that this error is not unique to me, but for some reason, no one knows how to solve it. Neither opening ports nor disabling the firewall brought me any closer to success. But there is another question. Namely... 2. Can I, having the game key (which can be found in Steam), download the Heroes client from the Ubisoft website and manually patch it to version 3.1? Or will I have to purchase Heroes 5 from them as well? I hope this helps because Steam downloads version 3.1 directly, but on Ubisoft, as I understand it, it's version 3.0... maybe Steam has a buggy build. Please, someone help me :(