An undocumented patch KB 4033637 was pushed to machines running Windows 10 1607 and it you are running Windows 10 Anniversary Update, and you also have the Automatic Update turned on, you probably also got it.
The undocumented patch rolled out the Automatic Update chute
Lots of users running Windows 10 Anniversary Update version 1607 have reported the roll out of an undocumented patch called “Update for Windows 10 Version 1607 for x64-based Systems (KB4033637)”.
There seems to be no official documentation on this patch, but it was discussed back in July on the Microsoft Answers forum where a user asked what exactly does this update do. The user was blogger Gunter Born who said that he has been trying to find out more information on KB 4033637 by himself online, but all he could find were a few articles saying that Windows is failing to update it.
When the patch reaches your device, Windows 10 Anniversary Update version 1607 system will show you that it wants to install KB 4033637. In case you have the updates blocked, it will not install automatically.
Lack of documentation on KB4033637
There is no documentation for this update for now, and there’s also no hint regarding what it entails.
Microsoft Update catalog features no entry about this and no KB article. On the other hand, users who have the Automatic Update enabled on a Windows 10 Anniversary Update version 1607 machine, will most likely have it installed by now on their systems.
The purpose of the mysterious update will remain unknown until further notice. This is not the first time such a thing happens, as there were more patches like this previously as well, throughout Windows history.
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