Hi Jeff,
That's correct. I don't have the SLStore folder.
But I don't see how uninstalling the Lightroom, and then installing it again from the same place where it was installed from on the first attempt, would change anything. In my original post the words "from the link above" refer to the link found in the post by Bani Verma (on Sep 11, 2017 9:25 AM) in this thread.
The link in that post is the same one where you suggest I get the "fresh copy".
I expect the result to be exactly the same, but I'll give it a try.
Here is a link that works:
Adobe Lightroom 5.7.1 Download - TechSpot
Gives a warning about expired certificate, but works just fine otherwise.
Don't need to change permissions of anything, or look for the folders, which are not there.