Microsoft released Windows 10 build 10565 a few days ago for insiders registered with Fast Ring.
So as usual the new build was only available through Windows Update for those who allow preview builds to be installed on their computers.
Today, however, company, for the first time released the ISO files while the build is still under development. So basically it allows you to perform a clean installation of the new operating system Windows 10 build 10565.
Please note that Microsoft does not typically release ISOs for Windows 10 builds that are exclusively available to Fast Ring users. But this time the company says it decided it as there were many requests from disgruntled users who couldn't activate older builds.
"We do not usually have ISO for Fast Ring builds, but we have heard that it would be helpful to try out new activation modes."
explained Gabe Aul, head of the Windows Insider program.
For all those interested below there are download links
Download links
If you wish to download ISO in a different language, you can do it by clicking the link below. (No ISO in English)
https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewiso