Thank you for your prompt response, @ecoinstant. I will respond separately to the timely follow-up response from @starkerz's message below.
As for this:
"... whether this is "your fault", is probably not a question we need to answer ..."
It matters to me little to not at all, how others characterize what I have repeatedly attempted to do, up until now. Other than to acknowledge I have clearly put a lot into these efforts.
I am not newbie, when it comes to computers. And I have done my best to capture, in considerable detail, what I would like to know myself, if I was being asked to help someone else, in a similar situation.
As I say at the end, if there is anything else I can do, please let me know.