The Windows 8.1 Media Creation Tool was the official way to download a 64-bit ISO or create bootable USB media directly from Microsoft. However, because , Microsoft has officially removed the standalone Media Creation Tool for this version .
Since the dedicated "Media Creation Tool" for 8.1 is no longer widely available, you can use the downloaded ISO with third-party or built-in utilities to create your bootable USB: windows 8.1 download 64 bit media creation tool
The tool will now download the full 4.2GB Windows 8.1 64-bit files. This may take 20 minutes to an hour depending on your internet speed. The Windows 8