Microsoft signs all ISOs with an Authenticode signature – verify via signtool verify /pa /v install.wim .

\sources\install.wim → ~5.2 GB (single Enterprise index) \sources\boot.wim → WinPE + Setup \efi\boot\bootx64.efi → UEFI bootloader \support\ → ADK tools, unattend samples

The 64-bit ISO will refuse to install on 32-bit CPUs or legacy BIOS without UEFI. For older hardware, you must use "Windows 11 LTSC" or bypass scripts (not recommended for regulated industries).

After downloading from VLSC (Volume Licensing Service Center) or M365 Admin Center:

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