Now it has re-released the update, fixing the issue while shedding some light on how many people were impacted by the bug.
After taking the unprecedented step of halting the rollout of the latest Windows feature update only days after its public release, Microsoft announced today that it has isolated the cause of the bug and is rolling out a fix to members of the Windows Insider Program.
Users who are affected by the issue are missing files and folders in their "Documents" folder.
"We have fully investigated all reports of data loss, identified and fixed all known issues in the update, and conducted internal validation", said John Cable, Director of Program Management, Windows Servicing and Delivery.
"Prior to re-releasing the October 2018 Update our engineering investigation determined that a very small number of users lost files during the October 2018 Update", stated the Microsoft announcement. Again, this is because there's a redirection, but old files remain in their default location, because OneDrive only used the redirect for autosave (for example, in a c:\users\username\onedrive\pictures folder).More news: Melania Trump rounds off Africa tour in Egypt
"If you have a Microsoft store in your neighbourhood you can visit it for a fix as well; perhaps you will be their first actual customer!"
According to Cable, the bug was related to how Windows handled a feature called Known Folder Redirection (KFR), in which "known folders of Windows including Desktop, Documents, Pictures, Screenshots, Videos, Camera Roll, etc." are reassigned to different locations on a machine's hard drive.
Only devices with Known Folder Redirects enabled were affected by the issue and there only if the feature was enabled but files remained in the default folder.
So just bear this in mind if you have successfully installed the Windows 10 October 2018 Update. However, it is holding back on releasing the new operating system generally until further testing is completed. You keep can saving files into the usual Downloads folder, for instance, and it's actually saved on another drive with free space, in other words. To make sure to remedy such issues, the Windows Insider team says that it is adding the ability to flag the severity of the feedback that they initiate.
Microsoft support technicians "have the tools to get you back to a good state", Windows Insider Program lead Dona Sarkar tweets.
#WindowsInsiders If you've run into the "missing files after update" issue for 1809/October 2018 Fall update, please call our support line.