Can't improve the armor of the Head of the thieves Guild (The Elder Scrolls 5: Skyrim)

I have all sucharetza, try to load previous save and try it, or reinstall the game. If you're not talking about the Nightingale armor

They say you should do the quest a change of leadership, without this will not improve either the problem is in the mod.

Come quests. Daring fashion. Reload the save game. In General, do what you said above

download mod improved Nightingale armor. and glamour of IO as you please. and deulofeu then...)))