Шутки в сторону

maybe it makes sense to continue the discussion here. I you havent already you can go and check in the Mods folder and look for Advanced Classes Mod readme.txt and also "Help" folder. Many questions can be answered there by reading. In short: advancing skills to Master and Grandmaster level requires enough points of a certain class (Warrior,Mage,Adventurer)
What you unlocked after battle was the Commander class. Commander classes can be choosen when you commander kills a stack in the beginning of the game.