HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

<<<r s>>>, thanks for the answer. Since you're not a Новичок, you probably know some of this yourself.
Well yes, in the HD mod description it is written in plain English:

Compatibility: SoD and Complete, as well as WoG, TE, WT.

And compatibility with any other mods is not guaranteed.
Install a normal version of "Heroes," and you'll be happy! :)
By the way, your nick gets corrupted in the message text; it's preferable to use readable character combinations- you're not 13, are you? ;)