The original Media Creation Tool for Windows 8.1 has largely been retired in favor of direct ISO downloads. Today, the process involves downloading the disk image (ISO) from Microsoft’s official website and using a third-party utility like Rufus to create your bootable USB drive.
Plug your drive into a working Windows PC and open Rufus. mediacreationtool windows 8.1
To download the Media Creation Tool for Windows 8.1, follow these steps: The original Media Creation Tool for Windows 8
Choose your version (e.g., Windows 8.1 or Windows 8.1 Pro) and language. mediacreationtool windows 8.1