Some users stayed behind after updating KB50753 for Windows 10 1903 in an endless hinting cycle. A message says the system needs to be restarted to fully install the update. Unfortunately, the message does not disappear after reboot.
This should be a user interface error. For some reason, the operating system does not recognize that the update is already installed. Here's a brief explanation of how to stop the cycle.
Cycle can be bypassed
If the user clicks on the displayed button and on the built-in reboot function, the problem should not continue. According to a user of the online community Deskmodder, after rebooting his system several times in the traditional way through the start menu without success.
Heise also found a desktop solution solution: Editors simply have a manual search for new updates using the Windows Update feature. After this process, the message is no longer displayed.