Start new game. Load trainer. Only use the easy kills option. Run through the main quest exclusively using the bow (one shot kills everything). Don't pick up any items unless you have to. Don't buy anything. Complete hunters hunted and coming storm quests in main quest line. Then play as otherwise.
Thanks! I played the game for a week or so, explored, did side quests, - until realized my main quest is broken at that stage, the npc in Didenhill doesnt has any dialogue at all, and starting from the previous saves doesnt solves the problem. I started the new character, made the fast run util this quest. Same bug!
I used only the 'easy kills' cheat for my third (current) character. And the quest finally works!