I can’t launch the game using HD.

The problem was solved at the dacha with the help of Rebellious – thanks to him. :D It turned out that it was simply due to my own clumsiness – I had once created a subfolder for the game and launched it from there. Later, I forgot about it and clicked on the shortcut on the desktop, which led to a different folder containing an incorrect version of the mod (or one that wasn't fully installed). Basically, it was just a silly mistake...
However, the connection problem with the mod remained on my home computer. With Rebellious, we checked everything through Mikogo, disabled the firewall, and some other things... In the end, we came to the conclusion that the router settings were to blame – I still don't know how to bypass this, maybe someone can help... :smile05: