Microsoft starts limited rerelease of Windows 10 update that deleted file. Problems started to arise when users started complaining about their files getting deleted on their own after updating to the Windows 10 (October 2018) Version 1809. The company had to stop pushing updates as soon as they got information regarding this. The update was only available to users who manually checked for updates in Windows settings.
Now, According to Windows Director of Program Management, the re-released verson has had all the bugs squashed and there are no issues in the new build. If you did manually update with the initial rollout and have an issue with missing files after the update, you should use the affected device as little as possible and contact Microsoft directly at 1-800-MICROSOFT, or find a local number in your area. According to the post, Microsoft support and its retail stores’ customer service personnel will help you out at no charge.