“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.
If you have checked for updates and believe you have an issue, please contact us directly at +1-800-MICROSOFT or find a local number in your area https://support.microsoft.com/en-us/help/4051701/global-customer-service-phone-numbers.
If you have access to a different PC, please contact us at https://support.microsoft.com/en-us/contactus/ (link will vary according to country of origin).
If you have manually downloaded the Windows 10 October 2018 Update installation media, please don’t install it and wait until new media is available.
We will provide an update when we resume rolling out the Windows 10 October 2018 Update to customers.”