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Follow the tool's instructions to create a bootable USB drive.

Once you've downloaded the ISO file, you can create a bootable USB drive using tools like:

While Microsoft typically prioritizes the most recent version (such as 23H2 or 24H2) on its main download pages, you can still obtain the 21H2 disk image through several official and reliable methods: Windows 11 Home and Pro - Microsoft Lifecycle

If you still want to use a third-party website, make sure to research the website thoroughly and understand the risks.