Microsoft released the long awaited second cumulative update of the month KB4490481 for Windows 10 version 1809 yesterday evening.
Why did it take so long to release when cumulative updates for all other supported versions of Windows 10 arrived on March 20, 2019? Because Microsoft learned from the mistakes it made when it released Windows 10 version 1809 and subsequent updates.
It appears, that Microsoft pushes updates for the current version of Windows 10 to an extra round of testing, courtesy of the release channel, before it releases it to the general population.
Update: Ran into a System Service Exception error on restart after installing the update on one machine. System Restore fixed the issue, Startup repair did not. End
The update has been released, finally. Administrators may check for updates manually using Windows Update to download KB4490481 to machines. The update is also available as a standalone download on the Microsoft Update Catalog.
Note: The update fixes a huge number of issues and still suffers from the same five known issues that previous versions of Windows 10 version 1809 suffered from.
Here is the list of changes:
The five known issues (check the support page for potential solutions):