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

Basically, I added the templates to the setup program. I renamed the version selection to "template." Here's what I got.
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It works.

I tried it too. I copied the folder with the templates, the selection appeared in the menu, I launch the game, and there's no "generate random map" button or whatever it's called. Where did I mess up?