Method 1: Download Windows 7, 8.1, 10 ISOs from Microsofts' servers You will need to use a valid product key to complete your installation or, for Windows 8.1 and 10, you'll need to install it on the same hardware it was originally installed on, if Windows was previously activated on that same hardware. These ISOs come in handy when you need a full reinstall of the Windows OS and the original installation media you had, is lost.
Microsoft offers ISO installation files for Windows 7, 8.1, and 10, but they are not always that obvious to find online.
