Okay, here's what happens. I was able to boot! That's the (very) good news. Now, the bad news is that this new version (clearly some updates DID take place) is a mess. The configuration is very awkward and it seems very buggy. I almost don't know where to begin in terms of the problems, but that's clearly the subject for a new thread, which will start shortly. In fact, one thing I will have to decide is whether to start a separate thread for each problem or try to knock if several in one..
Also, by the way, I noticed the little blue shield icon or whatever it is, and when I click on it, it still lists many updates. I thought that that's what it just did? Naturally I'm a bit skittish about trying this process AGAIN. It's like it's gotten to the point in which I willing to accept some "badness" out of fear that any attempt to improve things will just make them worse.