Microsoft released KB4508433 to addresses an issue when Windows Update Check for updates

In addition to the KB4505903 just described to fix audio failures, Microsoft is also rolling out KB4508433, which includes three improvements that will help improve the Windows Update experience. In addition, as a replacement for KB4506933, KB4508433 also brings an update to the service stack. Microsoft said that the Windows 10 service stack is primarily responsible for downloading and installing updated operating system components.

This update was released on July 26, 2019, and some devices have been installed automatically. Earlier this month, Microsoft also pushed the same update to testers of the Release Preview.

Changelog

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Key changes include:

• Addresses an issue in which an update may not install with certain other updates and upon start up after installation of the other updates, will require a second scan of Windows Update and a second restart to complete installation.
• Addresses an issue in which reserved disk space may not be returned to free space when installation of Language Packs or Features on Demand (FODs) fails or is canceled.  The disk space is returned to free space when Storage Sense is run.
• Addresses an issue when Windows Update Check for updates is run during the installation or uninstallation of an update, Features on Demand (FODs) or Language packs, which may cause the installation to fail and may cause a restart to take up to an hour.

Via: windowslatest