Please offer some advice.

Heroes 4 Alexander: how to pass through the flowers and mushrooms in the "Cursed Lands" scenario?

Pirated versions may have critical bugs. Perhaps the problem lies in this. There should be a quest house near the herbs, where you need to give vampires in exchange for passage. I tried to sneak through without giving the vampires, but it never worked. In the editor, the last section of the path seems to be completely blocked by local events. So, you won't be able to pass without giving the vampires.

Added 3 minutes later

Heroes 4 Alexander: how to pass through the flowers and mushrooms in the "Cursed Lands" scenario?

I wrote something different. Regarding the flowers and mushrooms in the upper Dungeon: if you go in the other direction through the Dungeon to the Tree of Wisdom, there should be a row of plants and a sign - a hint. It is with its help that the puzzle is solved.