I replayed it, defeated three red creatures, leveled up my heroes to 25-26, captured all the castles, and was congratulated on completing the mission, after which I ended up in the main menu. This was all done after purchasing the Russian version and applying patches up to version 1.3. I selected "start the mission again," replayed it, and the result was the same. Please share a save file at 1(dog)mgr.ru. I have no desire or ability to start the game over again.