[D][/D]Someone can correct me if I'm wrong, but the last time I used HeroLab for 4e, it required that you have a DDI account so that you can download and install the actual data from WoTC. Also IIRC, you only needed to use the account one time or whenever you needed to refresh/update the data. But since WoTC isn't updating DDI anymore, you probably just have to sign in once or if you ever reinstall HeroLab. It worked well enough for me, though personally I prefer WoTC's online or offline builder. If the online builder goes away, I'll probably give HeroLab 4e another try. I also have the offline builder from WoTC fully updated and installed and that is a great option too.
Keep in mind too that if you use HeroLab for other games, you pay a license for each game - you don't get to make any character for any game unless you've paid the license for that game. In the case of Pathfinder, you basically pay to add each expansion/splatbook. But it's all a one-time fee, no subscription required. (One again, correct me if I'm wrong, I haven't used HL in a while.)