For Windows 10 and Windows 8.1, you can download the ISO images without needing a product key. Now in order to download any of the latest operating systems, you have to visit the software download page here: Īcross the top, you’ll see Windows 10, Windows 8.1 and Windows 7. Previously, you used to be able to download ISO image files for Windows from a partner company called DigitalRiver, but Microsoft removed that option about a year or so back. In this article, I’ll talk about how you can download a legal ISO image from Microsoft for the latest versions of Windows and create a bootable USB flash drive so that you can install the OS on your PC.