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Siama, have you figured out where to find the unique hero and item? I entered the code for the DLC, but I don't see any changes. Which hero and item should appear?

I have an exclusive. I entered the code to unlock the exclusive content. The heroes appeared in Dynasty. In the "Dynasty" menu, you'll find the weapon in the heroes' inventory, and the map in the "Skirmish" menu - the map type is "scenario."
I think that when you unlock the DLC, the hero should also appear in Dynasty.
Buka writes that if it doesn't unlock, you should write to them. Unfortunately, I can't find the source right now, but it was somewhere on their website.

Added 1 minute ago

it didn't help((

It might be a silly question, but did you restart the game after making changes to the registry?