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

Could you advise a new player? I want to play with the HoMM3 HD mod online. If I install HoMM3 HD – the mod (add-on) – and play against a human opponent without any bugs or errors, does the opponent also need to have the same mod installed, or is there another way? When I tried to create a game, my opponent had the HoMM3 HD mod installed, but I didn't. After the initial loading screen, I was kicked out of the game.