Dear frosty,
The download link you are using is not for the IoT version of Windows 11 Enterprise. The installation media / download for the Windows 10 IoT Enterprise is only available from the secured Microsoft OEM website and not publicly available. There are in fact 2 portals: The GA/CBB/SAC version is available on the DPC portal: https://devicepartner.microsoft.com/en-us/
but the LTSC version is still in Beta preview and can only be downloaded through the Microsoft collaborate website.
Hope this helps.
Martin