I just upgraded my Z83-4 to 1903
Appears to be working just fine.
Only problem was an error "couldn't update system reserved partition" but resizing the partition using a free partition manager fixed the problem.
The update took hours and sat at 0% for quite a while.
Check this out....
https://support.microsoft.com/en-ca...m-reserved-partition-error-installing-windows
It has to do with MS fonts in the boot sector taking up space.
It's worked for me every time I've had trouble with this error. Takes 1 minute.
I'm on 1903 build 18362.295 with no problems and still 11.7 gigs on the HD.
Remember to delete old windows update files after updating.
Cheers,
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