Microsoft has released a Windows 10 update that fixes multiple bugs in Windows 10, version 1909 and Windows 10, version 1903, including issue causing Windows Update to stop responding and the lock screen to stop appearing.
The optional non-security KB4550945 update was published as part of the optional monthly “C” release and it only comes with Windows 10 quality improvements.
More information on the different types of monthly quality updates released by Microsoft each month is available in the Windows 10 update servicing cadence primer.
Additional info on optional updates starting May 2020 can be found in a Windows message center announcement regarding the timing for upcoming Windows optional C and D releases.
KB4550945 will be automatically installed when checking for updates using Windows Update and you can also manually install it from the Microsoft Update Catalog.
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