Microsoft released the cumulative update package KB4482887 for Windows 10 October 2018 Update (version 1809) and Windows Server 2019 (1809) on the channel Preview Preview. After the upgrade, the Windows 10 build number changes to 17763.346.
A cumulative update KB4482887 has become available for members of the Windows Insider program with the priority of receiving updates of the Preview Preview. The update is intended for Windows 10 version 1809 (October 2018 Update) based on x86, x64 (amd64), ARM64 and Windows Server 2019 (1809) processors for x64-based systems.
— Diamond Monday (@DiamondMonday) February 21, 2019
Installation via Windows Update
Cumulative update KB4482887 for PC is installed automatically through Windows Update. To check, go to Settings > Update and Security and click Check for Updates. To complete the installation, you will need to restart the computer. After updating the build number, Windows 10 will change to 17763.346.
At the moment, you can also download the update and install it manually only using the CAB files from the official Microsoft server.
Improvements and fixes KB4482887 (Build 17763.346)
Official information from Microsoft is expected on the next Tuesday of patches (March 12, 2019), when the update will be available to all users.