The rollout of the Windows 10 October 2018 Update (version 1809)* has been paused for all users as we investigate isolated reports of users missing some files after updating
The missing files after upgrading bug is perhaps the biggest and most serious problem found in this new version, and it was so significant that even forced Microsoft to stop the rollout.
Thankfully, the problem now has been fixed, and the October 2018 Update should no longer delete files after the upgrade.
The only caveat is that the fixes will not recover your files. If you upgraded to the October 2018 Update before the fixes were available and your files were deleted, you’ll need to contact the company directly. Although the Microsoft support team will help you recover your files, the company will not guarantee that you’ll get some or all of your files.
I did this update on day one and have not had any problems myself
But always best to be safe which Microsoft have done
If you’ve all ready done the update fixes are being rolled out in updates and a new release of this version of windows 10 will be out soon