https://wccftech.com/three-windows-10-versions-are-retiring-soon-including-v1909/

Windows 10 versions 1909, 1809, and 1803 are all going to hit their end of service deadline next month. Windows 10 November 2019 Update (version 1909) is currently the third most-used version of the operating system, with an 18.4 percent adoption rate. Many of our readers also consider v1909 as the last stable version of Windows 10. However, Microsoft has done a pretty solid job with Windows 10 v20H2 and v2004, making them the preferable Windows 10 versions right now.

Home, Pro, Pro for Workstation, and Pro Education editions of Windows 10 version 1909 will stop getting updates after May 11. Versions 1809 and 1803 are also being retired by the Windows maker (their Home/Pro editions are already retired). Microsoft posted the following notice, reminding users of the end of service deadline: