Thanks for responding. I actually, sort of, got it working last night after reading through an entire forum and jiggling things around. It's not working perfectly -- there seem to be some bugs -- but at least now my Daz3d seems to think it's working.

You know, the whole problem stemmed from content management and/or file organization -- as almost all of my problems with Daz3d seem to do. (I'm working on a Mac.) The script kept telling me to browse to the DS Defaults folder in my CONTENT/LIGHTS folder. In the end, part of the problem was, there was no LIGHTS folder in my CONTENT folder. I simply had to create one to put the DS Defaults in. This is endemic of my frustration in general: My content never seems to be set up like the content in the tutorials, or in the readme files, or whatever. Everything seems scattered and therefore confusing.

Perfect example: In my DAZ STUDIO  folder, I have several folders: CONTENT, DOCS, SCRIPTS, SHADERS, UNINSTALLERS, etc. However, within the CONTENT folder, in addition to the requisite RUNTIME folder, several of those folders are repeated, namely SCRIPTS, SHADERS, and UNINSTALLERS, but with different content.  I feel like I should be able to consolidate those folders with identical names inside the CONTENT folder, but I'm afraid to touch anything because I didn't set it up like this. It was just sort of in this disarray when I unzipped it. 

Any advice?