What exactly does KB2952664 do?

What more do you need to know?

Gerry,

Speaking for myself, here's what I need to know before I install KB2952664:

1. Exactly what is wrong with the current upgrade experience that warrants a fix to ease the upgrade experience?
2. In what ways does KB2952664 improve the upgrade experience?
3. What impact/consequences would one experience by initiating an upgrade without previously installing KB2952664?
4. Why can't Microsoft incorporate whatever KB2952664 does to improve the upgrade experience into the upgrade itself (so ONLY those who actually choose to upgrade their OS get the changes that KB2952664 brings, and those who choose not to upgrade are not subject to whatever KB2952664 does to improve the upgrade process).
5. If Microsoft feels that everyone needs to install KB2952664 (their persistence in unhiding it and re-inserting it into ones Windows Update list would seem to imply that) then perhaps KB2952664 does something besides just improve the upgrade experience. Microsoft's lack of transparency with this update does not breed much trust.
6. According to the current description of KB2952664, this update is in its 13th revision. Why did Microsoft need to revise KB2952664 so many times? What was wrong with revision number 1, and more importantly, is there anything wrong with revision 13?

I have no plans of ever upgrading the OS (Windows 7) on my computer ... I am quite happy with Windows 7, and the small improvements that Windows 10 has over Windows 7 is (to me) not worth the long list of disadvantages that Windows 10 has (compared to Windows 7). So I do not want/need KB2952664 to improve the upgrade process, and I will continue to hide it each time Microsoft inserts it into my Windows Update queue (at least Windows 7 gives one the option to manually install/hide updates ... unlike Windows 10 which forces all updates to automatically be applied ... but that's a subject for another thread).

What kind of improvements?  Why is it causing workstations to use more CPU time and memory?  Workstations are for users to work.  Upgrading to other operating systems is usually not part of users' work load.

Extract from KB2952554:

This update helps Microsoft make improvements to the current operating system in order to ease the upgrade experience to the latest version of Windows.

What more do you need to know?

I agree with langware. Windows will you answer the question in more detail of the actual purpose of KB2952664?

OK SO WHERE THE **** IS THE LINK TO DOWNLOAD THIS STUPID UPDATE. I HAVE BEEN ONLINE ALL STINKING DAY TRYING TO DOWNLOAD WINDOWS 10

https://support.microsoft.com/en-us/kb/2952664 .  It won't help with installing WIn10, though.  If you have followed the little Windows flag in the Task Bar and filled it out, it will pop up and let you know it is downloaded and ready to install.  I had the one of 4 PCs at home that I need to wait on installing for the next month be the first and only one to tell me it is ready.  It is also the only "Home Edition" I have, so I don't think I can use it to upgrade my "Pro" OSes.   If you look in the Windows Update history, you may see a failed KB that runs every day.  When you get the alert that you have the file, you will be ready to go.