So I followed this guide here https://www.youtube.com/watch?v=s1O7JuHzvJs.

And it worked the first time. 

But now I made a new project and every time I go to do the same thing, load an FBX exported out by Daz as instructed it asks for an FBX key. 
Basically any time I go to load an FBX it wants key. What key? Do I need to buy? I'm on trial and managed only one FBX import and 1 FBX export (which made no key). 

Not a very good first impression via this trial.