This thread was very helpful in getting one update thru...
After reading this thread, I was able to install the 1903 update. Removed the WLAN card and it went thru the update without incident.
This thread seems to confirm that thread and provide a little more information.
As near as I can tell, when I finally took out the WLAN card and the most recent install went thru, I'm now running Windows 10- 1903, which is now failing to update the July cumulative fixes. I've tried all of the "update fixes" like troubleshooter, using the on-line direct updater, removing antivirus software, disconnecting all peripherals, despite these efforts it still fails. DISM didn't help, either. Updated BIOS, almost catastrophic... won't do that again.
As it stands, the PC is running very well, especially for running a OS that is apparently incompatible and not supported with this model. I will continue to try incrementally to get the update thru, but having to go back down the rabbit hole every time a Win10 cumulative update comes out is beyond frustrating.
Any other info that anyone has, this forum has definitely been the most help, please post here with anything that has worked for you. Many thanks.