This nice try I copy it from the link you can find it at the end of this topic....... It’s great that Microsoft has made Windows 8.1 entirely free to owners of Windows 8, but unfortunately you’re limited to installing the update through the Windows Store -- unless you’re an MSDN subscriber there’s no ISO you can grab to install the operating system how and when you like. But as enterprising Reddit user redditorfor0seconds has discovered, there is a way of getting your hands on the ISO that only requires you to have a Windows 8 retail or MSDN key (but not an OEM key , apparently). It’s incredibly straightforward too, just follow these simple instructions: You’ll need to download both the Windows 8 and 8.1 installers from Microsoft . They’re 5.2Mb and 4.7MB respectively. Launch the Windows 8 installer (Windows8-Setup.exe). Enter your key when prompted and start the download process. Pause (don’t quit) the download when it hits exactly 1 percent. Exit that installer