Quote:Microsoft released KB4481031, a cumulative update for the .NET Framework 3.5 and 4.7.2 for Windows 10 version 1809 and Windows Server 2019 on January 22, 2019.

Several things were odd about the release: The patch was labeled as a preview, and it was available if users clicked on the "check for updates" button manually but also automatically through Windows Update.

Some administrators thought that Microsoft made an error in the documentation of the update -- which happened in the past -- while others that someone at Microsoft pushed the wrong button, again, to push an update to devices run by admins who were not seeking for it actively.

There is a reason why it is recommended to never hit the "check for updates" button manually on a device running Windows; it may push preview updates to stable versions of Windows or new feature updates that may not be ready yet for prime time.

Full reading: https://www.ghacks.net/2019/01/24/kb4481031-error-windows-update/