Buy the game.

I couldn't find it there.

It's there, I'm telling you for sure ;)

I'm not sure if I'm allowed to post links, but it seems like it's all official stuff, so the moderators shouldn't mind.

http://plati.ru/asp/pay.asp?id_d=1374100&searchstr=HEROES+VI&agent=0

Added 1 minute ago
By the way, I couldn't figure out the purchase process on Gamzaver (I heard many people buy it there), so I gave up on it.