If you purchased a retail license, you can find the product key within the product box. Have your Windows 7 or 8/8.1 product key ready. Review instructions here how to start a clean install if you desire, if you want to perform an upgrade, click here. How to download official Windows 10 ISO files Review complete instructions how to download the Windows 10 ISO in the following article:
If you are using Windows 7 Enterprise, Windows 8.0 Enterprise, Windows 8.1 Enterprise editions you won’t be able to use the free upgrade offer.
Windows 7 Professional, Windows 7 Ultimate, Windows 8.0 Pro, Windows 8.1 Pro must use a Windows 10 Pro ISO.Windows 7 Starter, Home Basic, Home Premium, Windows 8.0 Core, Windows 8.1 Core must use a Windows 10 Home ISO.Please note: The copy of Windows 10 you download must correspond with the edition of Windows you are licensed for: For the purposes of this article, We are using a Windows 7 license to perform clean install using Windows 10.
