I just wrote an Email to support and the return mail said to post here instead. It also said "You will be well served there." so I expect that now.
As you dont seem to visit the GOG forums I will post this here instead. In this thread there is a list of bugs described:
And there is also this older thread
https://www.gog.com/forum/fallen_enchantress/felh_24_bug_list - I dont know if the all points in there have been fixed or not.
Most notably in the 2.5.1 there is this newly (re)introduced bug described here:
Are you reading the GOG forum and just not posting there?
Is there a point to collect bugs?
Are you going to fix bugs yet? I have just tried 'Sorcerer King' and have already found an old (and still existing) FELH bug in it that couldnt possibly have been missed by a play tester. (And some new one/s too...)
In https://forums.sorcererking.com/497409/fallen-enchantress-v251 (which wasnt even posted on the FELH forum) most of the points are "random major balance changes" which dont fit with existing mods.
Edit: forum totally messed up my post somehow on first try