What exactly does KB2952664 do?

Stage 1: Denial...

https://www.theguardian.com/technology/2016/mar/15/windows-10-automatically-installs-without-permission-complain-users

I am helping clients buy new PCs with Win7.  No problem really.  Just have to avoid 6th gen Intel processors.  I intend to stick with Win7 for along time to come.  I am not sure which is more insecure:  Win7 with not M$ security updates -- or -- Win10 with no privacy, lots of annoying adverts, and an OS that can morph itself into something I do not like. 

No self-respecting IT manager would ever recommend Win10.   Since about half of all Windows computers are business ones, M$ will have a very hard time selling it to them.  I believe M$ will eventually need to offer them something different.  I am holding out hope for that.  If you recall WinXP got an extension well beyond their original end date for this very reason.

My anti-Win10 analysis

Microsoft has turned a decades-long respected process — Windows Update — into a malware distribution system.  It is for all intents and purposes forcing innocent and content Windows 7 computer users into “upgrading” to its new Windows 10 version.  It promises to allow return to Windows 7 within 30 days.  That return process is flawed and leaves your computer virtually unusable and requires re-installation of Windows 7.  For some owners without a re-usable Microsoft product key or a factory restore partition on their computers, it results in a useless thing that used to be a computer.

Windows 10 is a completely new and very different Windows.  Nothing like anything you have used before.

1.   It is primarily an advertising/sales vehicle.  That’s the keen motivation and reason it is free.

2.   By adopting Windows 10, you sacrifice any privacy — essentially, anything on your computer is Microsoft’s and its partner’s to use as they see fit.

3.   Windows Update becomes non-optional.  You, as owner of your system no longer have control over what happens to your computer.  Microsoft will re-make Windows (on your computer) into what serves its purposes without asking your permission or opinion.

4.   Windows 10 as a system is still full of un-fulfilled promises and bugs.  Many of your programs will not run on Windows 10.  In fact, the “upgrade” process removes some.

So, if you like Windows 7, and most do very much so, I advise you to reject Windows 10 for the foreseeable future.  Be advised that Microsoft has committed to support Windows 7 until at least January, 2020.  Most of your current computers will last that long.

FYI, my last employer regarded me as a Usability expert.

I have has some experience with Win10, but very little.  Best I could tell, in my brief encounter was that 10 was 8 only worse.  My 150 clients know that I will not support 10.  If they choose to go that way, I will no longer support them.  Out of those 150, one has chosen to go that way.

I had heard that MS would only support Win 10 on the newest processors.  This, obviously, is being done to force customers to Win 10.  i had hears that this had changed, but I have not kept upon  this specific topic.

Right.  Had they NOT supported Win7 I might've looked for an older gen processor (reluctantly).  But it was listed as an option, and it IS running WIn7, so I figured I was good.  Now I wonder if I'll be abandoned earlier than for older processors.

There are really only two problems I know of for Win10:

1. I DO NOT want MS to decide which updates I apply.
2. Telemetry.  (I know, they added that to WIn7 too -- I think I disabled all the services there and maybe I can do the same with Win10).

"They're also supposedly dropping support early for the skylake processors AFTER the fact.  I had heard that they were going to not support new processors, but figured that either it had it or didn't.  I bought a new computer, and now see that in about 18 months they will only provide the most critical updates, and only if it doesn't hurt other processors or something to that effect.  Has me pretty annoyed.  I made sure I was able to order this with Win7, and I just got it."

I had heard that MS would only support Win 10 on the newest processors.  This, obviously, is being done to force customers to Win 10.  i had hears that this had changed, but I have not kept upon  this specific topic.

As more and more folks are waking up to find that they have been mysteriously "upgraded" to Windows 10, this is starting to attract the attention of mainstream media. If Microsoft does not change course soon, it may find that "full speed ahead" steers it straight to damage control.

Seems like as good a time as any to repeat this:

The moment a company believes itself to be invincible is the moment it begins the process of proving itself wrong.

They WILL stop... define soon.  What is it, a month or two when the free upgrades allegedly will end, that's when it will stop.

They're also supposedly dropping support early for the skylake processors AFTER the fact.  I had heard that they were going to not support new processors, but figured that either it had it or didn't.  I bought a new computer, and now see that in about 18 months they will only provide the most critical updates, and only if it doesn't hurt other processors or something to that effect.  Has me pretty annoyed.  I made sure I was able to order this with Win7, and I just got it.  It has a Win10 pro license and came already upgraded to WIn7.  I figured that since Win7 was supported, I was good until 2020 or so.  Now I'm not so sure.  OTOH, I'm not sure I really want anything other than their security fixes anyway... I lost all respect and trust for them and their updates.