Right now we have a 100% success rate from 1709 to 1803 after the media was offline patched with the latest updates.
The downside is that the upgrade takes around one hour now instead of 40 mins with the unpatched media.
We have around 13 000 computers that's scheduled to update this year so we dont have much time to test 1809 at the moment.
I asked you earlier to state the computer specs, but you didn't answer. Can you please at least say what cpu is running (and maybe the chipset) please?