I would download the upgrade from windows Catalog and manually run it.
Before I did this I would of course have created a full OS Drive Image with Macrium Reflect Free, just incase fof some reason you have a failure that your can't recover from.
First update your SSU file to the latest
kb4508433 This has help many people get updated
KB4505903 This is the latest version of 1903
download it from Windows catalog. just google it KB it will take you to the catalog links on MS pages
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro