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

I can't update the mod. I tried through the lobby and in-game. It gives a message that I have the latest version, but that's not true. SoD

Try again.

In general, for any update problems, you can always update manually by downloading the full version from the site and installing it over what you already have: https://sites.google.com/site/heroes3hd/rus/download