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Windows 10 Creators Update ADMX for Group Policy
It appears that there's only the msi available for dowbload at this link https://www.microsoft.com/en-us/download/details.aspx?id=55080 Is this the only method available for getting the admx tem...
The new policy definitions are "installed" in
C:\Program Files (x86)\Microsoft Group Policy\Windows 10 Creators Update (v2)\PolicyDefinitions
Then you should copy them to the correct folder.
Hope it helps...