Now weighing in at Version 19.0, KB 2952664 is a “compatibility update” to ease upgrading from Windows 7 to Windows 10. The analogous patch for Windows 8.1, KB 2976978, is now up to version 22.0, and the patch for Windows 7 without SP 1, KB 2977759, stands at version 18.0.
All three have been re-released six times in the past three months. I talked about them on March 2, the last time they came out the Update chute.
As usual, there’s no list of items that are fixed and no incentive to install these versions. They’re marked Optional, so unless you look for them (and check them in Windows Update), they won’t get installed on your PC -- yet.
Personally, I don’t understand why Microsoft keeps ramming these patches down Windows 7 and 8.1 customers’ throats. It should be enough to wait until a customer indicates an interest in upgrading to Windows 10. Then they could get the latest version of Windows Update, bundled with the upgrade package. It may require two reboots, but that's a small price to pay for the free upgrade.
Instead, individuals -- and admins -- get treated to another round of thoroughly forgettable patches.