stuck in endless update loop between builds 10532 and 10547

I am currently stuck on build 10532. My frustration is due to the mandatory reboots that Windows 10 keeps scheduling during the middle of the workday, often when I am away from my computer. I have disabled this "feature" in the update settings but it persists. Windows 10 has downloaded build 10547 and keeps insisting that it needs to reboot to install it, but reboots never attempt to install anything; it is a routine reboot.

In troubleshooting this issue, I attempted to opt out of the Insider Program and downgrade to RC builds. When looking at those options, however, I discovered an error message: "Your Microsoft account requires attention to get insider builds." I clicked on the "fix" button and it had me log into my Microsoft account, including all that dual authentication stuff. In the end, the wizard closed out and I was presented with a "next steps" button to click. So I clicked that and it looped me right back into that same login wizard requiring dual authentication, at the end of which I found myself right back at the "next steps" button and the persistent error that "Your Microsoft account requires attention to get insider builds."

Clicking directly on the "stop insider builds" hyperlink below that button produces a popup box stating that "We need you to do a few things to stop receiving builds." Below that statement is a hyperlink titled "How do I opt my device out of Insider builds?" Clicking on *that* hyperlink takes me to a web page at windows.microsoft.com telling me that all I need to do is go into the advanced options for Windows update and click on the "stop insider builds" hyperlink. Clicking on that does not, however, give me an option to verify my choice. It just returns that same error message about "We need you to do a few things to stop receiving builds." At no point does it tell me what those things are, it just keeps looping back on itself.

Is there a way to break out of the loop without reinstalling the OS altogether?

UPDATE: I might have made some progress. A few months ago an update corrupted my user profile, requiring me to create a new profile. I was reluctant to delete the old one because I wondered if maybe some key file was still locked up in it that I might want later. I think, however, that because the corrupted account was still linked to my @live account, there were conflicts. Not sure why it took more than two months to surface, but when I just deleted that corrupted account I was able to download security updates and I'm no longer getting that error message to "fix" my updates. It still loops me when I try to opt out of the Insider Program, but at least half of the problem has resolved. I'm going to reboot once again and see if that does the trick.

SECOND UPDATE: Rebooting is now permitting a re-download of build 10547. I still am not able to opt-out of the Insider Program, but maybe after completing the update....

I have also experienced this effect but have only the user profile (not corrupted) and despite repeated attempts to update, cannot initiate build 10547.