Alternatively, use Microsoft’s official or Fido script (PowerShell). Here is the most reliable manual method:
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If the direct ISO link is providing the latest version (e.g., 23H2) and you specifically need 21H2, the is your best secondary option. 23H2) and you specifically need 21H2
Here is the secret that IT pros use: You can download the Windows 11 ISO from Microsoft, then use a free tool called Rufus to burn it to a USB drive. download windows 11 21h2 iso file 64bit microsoft top