The cumulative update package KB4540673 (OS Build 18363.719) is designed for Windows 10 version 1909 (November 2019 Update) based on x86, x64 (amd64), ARM64, and Windows Server 2019 (1909) processors for x64-based systems.
The cumulative update package KB4540673 (OS Build 18362.719) is designed for Windows 10 version 1903 (May 2019 Update) based on x86, x64 (amd64), ARM64, and Windows Server 2019 (1903) processors for x64-based systems.
Cumulative update 4540673 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 your computer. After the upgrade, the build number of Windows 10 will change to 18363.719 for Windows 10 (version 1909) and 18362.719 for Windows 10 (version 1903).
Improvements and fixes to KB4540673 (Builds 18363.719 and 18362.719)
Fixed an issue that prevented updating the operating system on some devices due to damaged third-party builds.
Security updates for the Windows App Platform and Frameworks, Windows Media, Windows Silicon Platform, Microsoft Edge, Internet Explorer, Windows Fundamentals, Windows Authentication, Windows Peripherals, Windows Update, and Windows Server.