Okay. I have DAZ Studio 4.0 Pro. I just upgraded from my original version 3 months ago when they offered the pro version for free. Now I see on the DAZ 3D website that 4.5 Pro is being offered for free. 

Here are my questions: Is there much of a difference in my version and the new 4.5 Pro version? Is it worth upgrading so soon after my last upgrade?

From what I am seeing, the latest upgrade is free for a limited time only. It supports certain extra software that allows developers to create content for DAZ Studio 4.5, which kind of fits in with my goals of making things for the software that I can upload to various sites for sale. Of course i already have the Content Creator Tool Kit installed in 4.0 Pro, so I'm wondering what to do.