Changelog for Cumulative updates released on March 10th, 2020 are as under:
Windows 10 1903 and 1909: KB4540673(OS Builds 18362.719)- Windows 10 version 1809: KB4538461(OS Build 17763.1098)*
For Windows 10 1903/1909, It is recommended to install servicing stack update KB4541338 before installing the cumulative updates.
Direct Download links
KB454067332-bit update can be downloaded using this link and 64-bit can be downloaded from this.KB4538461 32-bit link is here and the 64-bit link is here.
Servicing Stack Update KB4541338 for Windows 10 1903 and 1909
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Update 12/03/2020
KB4551762 is now available for Windows 10 version 1903 and version 1909 that jumps the build number to 18362.720 and 18363.720. See this for more information.
32-bit MSU file of the update is available here and 64-bit is available here.
Windows 10 update history
https://support.microsoft.com/en-in/help/4529964/windows-10-update-history
Windows 10 release dashboard
https://docs.microsoft.com/en-us/windows/release-information/status-windows-10-1903
Follow @WindowsUpdate to find out when new content is published to the release information dashboard.
*Support for Windows 10, version 1809 ends May 12th 2020.