The users recently discovered a critical bug in Windows 10 October 2018 Update (version 1809) that causes an unexpected removal of files such as documents and pictures during the upgrade process.
There’s a growing number of users reporting the same problem and Microsoft has finally paused the rollout of Windows 10 October 2018 Update.
Today, Microsoft announced in a support document that the Windows 10 October 2018 Update has been pulled and you can no longer download the feature update.
Microsoft explains that the company is investigating the reports and the update will be republished when a fix is deployed to address the critical bug.
"We have paused the rollout of the Windows 10 October 2018 Update (version 1809) for all users as we investigate isolated reports of users missing some files after updating," Microsoft explains in a support document. "We will provide an update when we resume rolling out the Windows 10 October 2018 Update to customers".
If you're having issues after installing the Windows 10 October 2018 Update, you can recover back to the previous update by heading into Settings > Update & Security > Recovery. At the moment, there’s pretty much no way to recover the lost data.
Update 10/7/18: Microsoft has stated that they can recover files deleted by the October 2018 update. More information here.