Hello,
Download the update KB4517389 manually: https://www.catalog.update.microsoft.com/Search.aspx?q=KB4517389 and install it using this guide: https://www.kapilarya.com/manually-download-and-install-windows-updates-in-windows-10
If issue still persists, try these suggestions:
- Run Windows Update troubleshooter: https://support.microsoft.com/en-in/help/4027322/windows-update-troubleshooter
- Reset Windows Update database:
Open administrative Command Prompt and type following commands one-by-one followed by Enter key.
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\catroot2 Catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
- Reset Windows Update components: https://docs.microsoft.com/en-us/windows/deployment/update/windows-update-resources
Hope this helps!
Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.