Hi Bill,
I had issues trying to get a child theme to work. It kept saying it was an invalid theme.
I foudnd the culprit. In the style.css file in the child folder, the instructions say that there must be the following:
Template: Responsive Visual
However this didn’t work for me, I had to use:
Template: responsive-visual
Which is the actual folder name on the server rather than the actual theme name in the style.css file of the parent theme folder.
Ciao,
Adrian