[German]Microsoft has re-released optional Updates KB2952664 for Windows 7 SP1 and Update KB2976978 for Windows 8.1 on June 6, 2017. Both updates has been re-released cyclically by Microsoft, but there has been issues within the past, so these updates also has been pulled several time.
Update KB2952664 for Windows 7 SP1
Update KB2952664 is a Compatibility update for keeping Windows 7 SP1 up-to-date. Microsoft writes:
This update performs diagnostics on the Windows systems that participate in the Windows Customer Experience Improvement Program. The diagnostics evaluate the compatibility status of the Windows ecosystem, and help Microsoft to ensure application and device compatibility for all updates to Windows. There is no GWX or upgrade functionality contained in this update.
This Update will be offered via Windows Update and is available via Windows Update Catalog. My recommendation: Hide this update, except, you plan to upgrade to Windows 10.
Update KB2976978 for Windows 8.1