All questions regarding mapmaking for Heroes of Might and Magic 3: The Shadow of Death.

I'm interested in a utility or patch for the map editor that would allow setting a strictly fixed value for an object (like a resource or something similar). Ideally, it should be compatible with HotA. If there isn't one, I would appreciate a recommendation for someone who could explain step-by-step what to click and in what order. P.S. I tried to install Modhomm3, but it didn't work. It says the program is incorrectly installed, even though I followed all the instructions: http://modhomm3.free.fr/