
Beginning from Windows 10 Build 10586 (version 1511), user can directly install and activate Windows 10 with Windows 7, Windows 8, Windows 8.1 or Windows 10 product key.Ī valid Windows product key is required when directly installing Windows 10 for the first time on a device.

The free Windows 10 license with permanent activation also applies to computers upgraded to Windows 10 final RTM Build 10240 from Windows Insider Preview Builds and pirated copies of Windows managed to trick Microsoft into believing it’s genuine. No product key is required (by skipping the product key entering) when clean install Windows 10 from scratch on a device which has previously upgraded to Windows 10 and gets activated in the past (hence the HWID, the hardware ID, is recorded on Microsoft activation server).No product key is required when upgrading Windows 7 or Windows 8.1 that is genuine and activated to Windows 10.

