Hi Gordon!
I believe a clarification is needed: Most of the asset packs in the collection are assets used for different situations (such as tilesets, battlers, etc).
The character Generator itself comes bundled with all the data you need to use. However, the product is in an Early Access state. It means that the collection of assets as of this moment is limited, but will be expanded for free in the coming weeks.
When you unzip the character generator, you'll find an executable. You need to lauch that executable file for the program to start. Once it starts, it'll load and recognize the zips by itself. From there, click in any of the categories to check the assets.
You must always choose a body type first thing, or else nothing will load. Assets are always loaded by body types, and that might be the cause of the confusion.
Hope this helps, we'll walk you through if you have more questions, we're always happy to help!
- Rayane