Try:
Right click on start & choose powershell with admin & enter:
SFC /SCANNOW
DISM /Online /Cleanup-Image /StartComponentCleanup
DISM /Online /Cleanup-Image /RestoreHealth
Can other updates download fine?
If you’re running Defender check that the definitions are installing.
Is Windows activated?
You can also try the windows update minitool to update Windows:
https://www.majorgeeks.com/files/details/window...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.