Would it be possible to obtain a troops.txt file from one of our eastern european brethren that are able to upgrade troops?
From what I understand of the filing system, this is the one that controls what upgrades to what, and looking at it, none of the troops have any upgraded forms set. So I am figuring that if someone had a working one, it might be possible to replace ours and have it working again. Or at the minimum figure out what upgrades to what, and change the upgrade path manually.
I would do this myself but it is a huge headache to try to figure it out since the game uses stuff like unit ID "trp_mercenary_swordsman" but the name is actually "Mercenary_Marksman" (swords = muskets?), and all the old factions (khergit, vaegir, ect) are still named in the unit ID's.