MMH5.5 - Heroes of Might and Magic 5.5

Thank you for the answers, I figured it out.
The problem was with the client itself, even though it was version 3.1.9, but it included the online expansion. When I installed it on a clean system, everything worked.
Maybe someone else will encounter this problem.
I have another question: outposts cannot be rebuilt. Cities and dwellings of levels 1-3 are rebuilt normally, but outposts cannot be rebuilt at all. Are there any special conditions for rebuilding them?

If you refer to changing dwellings to your faction, there are 2 rules that restrict the change:
- the visiting hero must be of the player's starting race.
- there must be fewer faction dwellings on the map than the global limit. There is a limit variable H55_AmountExtraTownsDwellings defined in <game folder>/data/MMH55-Settings.pak/scripts/H55-Settings.lua. Change it from 1 to 100. This will allow you to convert as many towns and dwellings as you want. Unfortunately, configuration changes only work on new games.