You need to visit VLSC for Windows 10 IoT downloading or buying.
Microsoft Volume Licensing Service Center
https://www.microsoft.com/licensing/servicecenter/default.aspx#maincontentdiv
In fact, you could download Windows 10 Enterprise LTSC for trial, Windows 10 Enterprise LTSC and Windows 10 IoT Enterprise are the same product.
https://www.microsoft.com/en-us/evalcenter/evaluate-windows-10-enterprise
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