NHF – new heroes for Heroes V 3.1.

Do you have any idea why these mods stopped working in the new version of the Heroes mod, when everything worked perfectly in the old version?

Most likely, this is related to the MCCS engine, which NHF has switched to.

Added 5 hours 50 minutes ago
I quickly reviewed the skills.xdb file - in NHF, the "value" parameter of hero perks has been changed. I don't know what this affects... perhaps the AI, meaning it takes these skills more often, or perhaps the calculation of the hero's strength in duel mode (there is a strength filter there).