New
#11
"Windows Update Troubleshooter tool (which reported issues with existing update files in the system and offered option for me to delete these. Took that option. It then reported that it fixed some broken links/files.)"
That tool is built-in to 1903 and at least thru 1803. I like to run that BEFORE trying any Feature updates. Have done 1903 updates to over a dozen computers that I support already, several with 1803 and not one has failed on the first try from either 'Download and install' button on Settings/WU page or by downloading and creating an ISO and running within Windows.