I really don't have any idea, since it has always been said that the different versions aren't compatible. I didn't change the starting date or create new agents. Maybe new affiliations or "too young" players
Made this update for personal use, so there might be little tweaks here and there. Ages and so on unchanged since I was always going to simulate closer to present day before playing. I treated every loan transfer (where applicable) as a permanent one to make the editing faster/simpler. For the...