So I've been trying to get onto 1809 from 1803, Check for Updates thinks I'm up to date though I am not, whatever. I'm using W10 Update Assistant downloaded from the October 2018 update page instead, it sees there's an new version available (1809), downloads it and installs fine.
I then restart as instructed and the update progress bar reaches 16%, it then reboots and goes to 'Undoing Changes', reboots again and I'm back on 1803, update failed, no error message or anything.
I've tried clearing the update 3-4 times now with clean update files, restarting W10 update services and running the update troubleshooter, none have fixed my issue.
What am I doing wrong here? I thought this update was made public yesterday, seems like the updater is flat out refusing to continue.