https://wccftech.com/windows-10-october-2018-update-deleting-user-data/

Windows 10 October 2018 Update has been available to the public for less than two days and the complaints have started to drop in. Yesterday, we reported that Microsoft and Intel had published an advisory explaining that the October 2018 Update could result in excessive processor demand and reduced battery life, pushing Microsoft to block the update for a few devices. It now appears that the latest Windows 10 version is also deleting user files during the upgrade process.

Windows 10 feature updates rarely bring smooth upgrade experience and are almost always plagued with problems. However, this year Microsoft pushed it out a little too soon without having it pass through the Release Preview ring Insiders.