4 map campaign for the alliance (Might and Magic: Heroes 7)

you need to kill Sergei and all his comrades and prevent the capture of cities, in short, Sergei knocked down, including, but he constantly respawns in one of the cities and does not allow the mission to be completed (bug), I thought patch 1.4.1 would fix everything, threw old saves into a new one the patched game - nothing has changed, who escaped how?