I noticed that Reallusion offers Realistic Human 100 pack with Crazytalk 8 pipeline. How do I use Realistic Human 100 pack? Is it a software or is it just a pack of pictures? How do I use that pack to create heads for humans in Crazytalk 8?

I saw some tutorials and noticed you can do face fitting in Crazytalk 8 using photos. So what is the connection between Realistic Human 10 and Crazytalk? What software do I use to texture and cutomize those 100 characters that come with Realistic Humans 100 pack? Does Realistic Human 100 comes with character creator? If so does character creator output the face file as .RLHead which we can import into CT8? 

Note: I have never used CT8 or character creator before. So I am totally a beginner with this software and need to make an informed decision prior to purchasing the software and content packs. Thanks for your help.