Thank you very much, Tom, for your prompt and helpful feedback. I have included a few follow-up questions below.
(2) -- I will be looking forward to your feedback about where/how I should register my site once this link is available again.
(3) + (4) -- I confess to being a bit confused, even after reviewing your screenshot.
-- I thought there were theme/template settings for the website itself (which is what I was inquiring about) as opposed to the theme/template settings for the individual LOs. Is that not the case?
-- Moreover, when I checked the "Central Templates" section of my installation (see attached screenshots), the only named theme I recognized was "Nottingham". Specifically, I found no reference to the XOT themes or Bootstrap themes.
-- In addition, when I clicked the "Update template list" button, nothing seemed to change.
Am I still missing something?
And/or does my installation need to be on a server other than my own in order to have access to all the latest website themes/templates?