Thank you :-)
I had looked over all the options in the program, found nothing ... so I "hid" the C documents and rather than asking where they were, the program recreated them. So then I searched for an answer and found that if one goes about it from the OS, the goal can be accomplished.
Reading your post, okay I looked again, there is a Browse if I want to look for something yes ... possibly I do not recognize the correct wording to accomplish the goal to have the main program on C, and all the Document folder on D.
Any way, it is all done now. {and the program is not recreating a Documents folder on C}
And so I merrily went off to purchase a file I had tested one of the freebies from. The freebie worked. The purchased product did not. Not exactly the best day in 3D I've ever had. Maybe tomorrow will be better.