https://wccftech.com/microsoft-windows-10-19h1-18272/

We may still be waiting for Windows 10 October 2018 Update to arrive (hello Microsoft, it’s going to be November very very soon…) but the work on Windows 10 19H1 slated for a Spring 2018 release continues in full force. Windows 10 Insider Preview Build 18272 is now available to Insiders in the Fast ring. The company has also made ISOs for Build 18272 available (click here to download them).

Microsoft reminded once again that Insiders should expect bugs as is “normal with builds early in the development cycle.” If you want stability, you should consider switching to the Slow ring, which is currently still testing and improving Windows 10 version 1809 (aka the October 2018 Update). Microsoft also said that today’s build isn’t available for ARM devices running languages other than English (U.S.).