The activation was base on MS procedure, for that matter, an internet connection was required during the process of installation. All pre-release product keys published earlier for builds of Windows 10 Insider Preview have been deactivated and will no longer activate any Preview builds, including Build 10240. Those of you have downloaded Windows 10 ISO image after joining the Insider Program, probably have noticed the product key on the download page. None of the windows features have been removed, and no cosmetics have been implemented. Pre-release product keys for Windows 10 Insider Preview have been deactivated. Whether you want to install Windows 10 Preview on a virtual machine or on a spare PC, you need the product key to complete the installation. This build works on clean installation only. Today, we are introducing the next feature update to Windows 10: Windows 10 Pro.While we are excited for the next generation of Windows with Windows 11, we are also focused on supporting the more than 1.3 billion monthly active devices on Windows 10.

Windows 10 insider preview activation