Microsoft download links for Windows 7, Windows 8.1, and Windows 10
If you’ve ever lost the installation media there’s a way to get it directly from Microsoft for Windows 7, Windows 8.1 , and Windows 10. Microsoft is now providing ISO downloads for all three versions of Windows.
In order to download the ISO, you will have to provide a valid product key. When you enter the key, Microsoft servers validate it and once it passes validation you’re able to download the ISO.
Here are the download links for each version of Windows. Note that if you have a volume license version of Windows you’ll need to visit the volume license portal to download your ISO. These links are for retail, and possibly OEM (not verified) versions: