Patch 3.1 for version 3.0.

Friends, I have the same problem. But the game is not a pirated copy; it's a licensed version from Buka. Why can't I apply the patch?

Because the patches from Nival don't work with the licensed version from Buka... you need to download a special patch from the Buka website.

P.S. For convenience, here it is: http://www.buka.ru/cgi-bin/show.pl?option=Show_patch&id=466

P.P.S. I struggled with this myself.