What exactly does KB2952664 do?

You're being too generous calling it a problem.  They want all users pushed to WIn10. ... they are pushing people who have been loyal for decades away, but they are counting on most people giving up and accepting "the inevitable".

Yep ... you are right.

From Microsoft's perspective .... disrespecting their customers does not appear to be a "problem" :(

Microsoft could fix this problem?

WHAT PROBLEM?

This is not a problem, it is their design.  You're being too generous calling it a problem.  They want all users pushed to WIn10.  In the process they are prob'ly making money for apple, as they are pushing people who have been loyal for decades away, but they are counting on most people giving up and accepting "the inevitable".

... it is pretty clear if the person clicks on Accept instead of Decline on the win-10 terms to fully install win-10 it happens. ...

ThrashZone,

One sees so many long and complicated End User License Agreements these days that I suspect few people (even savvy computer users) actually take the time to read and understand the Agreement. Most people have become conditioned to just click "Accept" and go on.

So it's not unexpected that a computer unsavvy user could see the Windows 10 End User License Agreement pop-up, and routinely just click "Accept".

I am not condoning that behavior ... I am just saying that it probably happens quite often ... and Microsoft takes advantage of computer unsavvy users who do not really understand what they are doing when they routinely click "Accept".

Let's not blame the victim (computer unsavvy user) ... especially when Microsoft could very easily fix this problem with a well documented option that says: "Do you want Windows 10 installed on your computer ... Yes? No?" If the user clicks No, then no further Windows 10 updates/nags would be presented to that user.

Yep a person could be set on Automatic download and install updates

And as long as the magic Give me Recommended updates the same as Important updates box is Unchecked they would not be facing win-10 auto installing

Yea M$ has gone out of their way coming up with lame reasons why they have offered win-10 this way = no doubt :)

Using an excuse like M$ is receiving feedback that people can't find win-10 lol

Again you have to wonder whom M$ is receiving this feedback from = The blind :D

It's NOT just knowingly accepts it.

1. They HAVE put some sucker downloads in important updates.
2. They had a security update for IE that included some nagware.
3. I understand that they had a popup, if you unwittingly included one of their downloads, that offered to "upgrade" you, with ONLY an OK box.  NO "GET THE H OUT OF THERE" button.  So how many people would've known to either check the X in the corner, or kill it with task manager?
4. I used a work computer somewhere (not my regular work), and there was an icon in the system area that I thought was "display desktop".  It started to set up Win10!  Luckily I was able to cancel it!
5. I always used to accept ALL security updates and most others; occasionally checking if the name wasn't clear.  MOST of these sucker installs do NOT tell you that it is setting you up to install Win10; you can only google EVERY DAM ONE and see what you can find on it, generally not from microsoft.  So now I'm far behind in updates because I'm too busy to look up every one, and I can't even trust them with the security updates.  Tell me that is not underhanded at best.

This is NOT set up to trip up idiot users who don't deserve their job, it is microsoft making every effort to trap everyone.

I've said this before, I NEVER update operating systems -- I generally buy a new one in sufficient time to get the latest then.  I'm even way behind on that because I have no idea if I'll get one with Win10, or one upgraded to Win7 (knowing it will expire sooner).  A good part of that is that you can NOT refuse ANY update unless you forego all including security ones.  There's also my feeling that they will turn more and more standard features into extra cost subscriptions; I think they did that with some media player or something, I forget the details.  I likely already have other software that does it, but who knows what they'll take away next?  But mostly it's the inability to refuse updates, and with this current arrogance, they have proven to be untrustworthy in that.

I have disabled all I can, with the registry and group policies, that SHOULD stop me from accidentally be downgraded to Win10 or to get nagged about it.  I recently got GWX Control Panel, although I'm not sure if that stops anything or just lets you check if you fell for one of their updates.  So far it found nothing -- I just checked and found one thing I missed: I did not download anything but have not disabled their "Get Window 10' icon app.  I just clicked on that button to disable it.

Never before have I given this any thought, and likely not for this next computer, but I am already thinking of dumping Windows and going Linux next time.  It was NEVER an option before, and I have no idea if ALL my software would work there, but this arrogance has gone too far.