Originally posted by kibbostrom:

Depends upon the old world, though it should work. Just do remember that the biome updates will only happen to the unexplored areas (you must have been farther than 500 metres away from them). Now this means that I hope that you did not explore the entire world (vikings got to explore, right?).

Thanks for input, i found info about this. Well i dropped old world cuz I've Explored big part of the land.