The US Microsoft released the ISO image file of “Windows 10 Insider Preview” Build 19013 (20H1) in October. Currently available for free download from the company’s website.
“Windows 10 20H1” Build 19013 is the latest preview released on “Fast” at the end of last month. You can test the enhancement of the emoji panel that can be called with [Windows] + [.] Key, and the improvement of the memory management of “WSL 2”.
To download image files, you need a “Microsoft account”. If you log in with an account that has joined the “Windows Insider Program” from the “Sign in” link at the top right of the download page, a pull-down menu for selecting a build will appear.
You can also download an ISO image file of “Windows 10 19H2” Build 18363 (“Release Preview” ring) on this page. The build is expected to be officially released this month as the “November 2019 Update”.