Once on the page, scroll down. You will see a dropdown menu. Select Windows 8.1 .
If you need to perform a clean installation, create a backup USB drive, or upgrade a machine that has crashed, you need one specific tool: windows 8.1 download 64 bit media creation tool
Remember: The key to success is ignoring the false redirects on Microsoft’s site and using the software-download/windows8 URL specifically. Once the tool is running, creating a bootable 64-bit USB drive takes less than 30 minutes. Once on the page, scroll down