Update:
Today I submitted a e-mail to support for information.
When I ran new ver 5.52 again today I got a message Trial / Demo was over and I could not run or test Debut again.
So I uninstalled it.
After that I followed previous (thank you elk) instructions to clear out folders/data.
Then, instead of copying my backup Folder/files to (C:\Program Files (x86)\NCH Software), I ran the installer (setup.exe) for my old version of Debut.
I wanted to test Web Cam input for Mic and Sound from Speakers to see if that would work.
While setting up options and testing I got a message from Debut that I needed to restart the PC for changes to take effect for using the speakers.
After that I now get recorded audio from my Headset Mic and also from the Speakers (recording the video).
So, the problem was mine alone.
Debut is working just fine in WIN10.