The Fall of Voron

...the Blue Guardian is very far away, and it's quite a long walk to get there. But Lord Banly easily made his way through the trees and leveled up as much as I wanted. Is this a bug or a feature?

I just didn't notice. There shouldn't be a path there if I understood the location correctly.

I wanted to know - is Kurak's army stable, and does it not matter when you take all three cities, or did the fact that it was the 6th month play a role?

The deeper you go into the forest, the stronger the partisans become.
:) Kurak's army formula.
number of weekly increases = (3 + diff + [random number from 0 to 4]) * week of the game)
For each slot, from the weakest to the strongest, a total of 7 slots.
diff - difficulty level (from 0 to 3). I don't remember all the details anymore...
The count starts after capturing the Orc cities; after a few days, Kurak will appear.
Of course, the 6th month is already too much.

Were there any scripts in the map to change units in dwellings?

No. There are some built-in mods to change heroes, but everything is clean regarding dwellings. The 'readme' file describes that it's best to remove other maps and mods before playing.