: Microsoft previously offered a specific utility for this. You can search for the "Windows 8.1 Media Creation Tool" to download an executable that guides you through creating an ISO file or a bootable USB drive.
: If you have a professional Visual Studio subscription, you can log in and download official, verified ISO files for Windows 8 and 8.1 with official SHA-1 hashes for security. Third-Party Alternatives (Use Caution) download file iso windows 8