Microsoft has let it be known that checking for updates on Windows 10 PCs that run the stable-channel 1903 version may result in the ability to download its successor, 1909. This November 2019 replacement for that build can also now be accessed by business users and server maintainers.
https://www.notebookcheck.net/Microsoft-rolls-the-November-2019-update-out-for-Windows-10-devices.442752.0.html