Sorry Microsoft you have blown it. This is not the first time I have had issues with Windows 10. I believe that with Windows 10 Microsoft decided , quiet arrogantly, that they no longer need to involve the owner of the PC in any updates. Result is that when they get it wrong the user is left trying to fix corrupted files and worse.
As an IBM Retiree I did not expect to have to go under the covers on a regular basis to keep my operating system going.
I see that 1803 is a feature update. Sorry Microsoft I dont want your features!
For interest here are some steps I took. None of which fixed the problem
Ran Wurest
Right clicked on BAT file then run as admistrator -failed
Reran Update
Still failed the Feature update ( others were OK)
Ran Scannow
Search box type cmd
Right click on the command prompt and run as administrator
Type the following and enter
SCF/SCANNOW
Ran but found errors it couldn't fix
Ran chkdsk as follows
Right Clicked on C drive in normal way
Select Properties
Tools tab
Press Check button
It fixed some errors in that area, but didn't fix the problem.
Bottom line. My windows 10 Machine is going in the cupboard and I am now running my Windows 7 machine as live.
Next Action: 1 None on the Windows 10 machine
2 Monitor this forum to see if Microsoft acknowledge the issue.