ISO’s are live for Windows Insiders.
What are ISO files?
An ISO file let’s you clean install a new version of Windows 10. The clean install will reset your laptop to factory state.
You will need to install the Windows 10 Insider Preview build on a device that has been previously activated with Windows 10 or with a Windows 10 product key.
You’ll need a third-party program to convert the ISO file into installable media—DVD burning software often includes this capability. Our team recommends mounting the disc with Windows Explorer and then transferring the files on the mounted disc to a formatted USB drive.
Remember, trying out an early build like this can be risky. That’s why we recommend that you don’t install the preview on your primary home or business PC. Unexpected PC crashes could damage or even delete your files, so you should back up everything.