Hi Clifford…I’m back. What I did was installed Luminescence on my local test site, followed by installing the child theme for it (activate it). I then copied (uploaded) the index.php and sidebar-blog-left.php files to the child theme (where you find the style.css for it). Made the edits of the two files, and it worked.
So to follow up, where did you put the files?
Make sure they go in this location:
Basically with child themes, any file you plan to edit, you are duplicating the location of the file(s) as they are in the parent theme.