Yes, Windows 10 ISO is free. Windows 10 can be downloaded from its official website for free. But there are some limitations to using the Free/ Pirated version of Windows. But here we will be going to see how one can download the Windows from it’s an official website and then install it. Also, you can go through this to download Windows 10 ISO. Windows can be downloaded in the form of ISO file which is also known as Disc Image. First, you need to download the ISO file then you need to burn it in on DVD or USB flash drive.