Hi Bowness, David,
The adm files should locate by below path:
Windos\SYSVOL\domain\sysvol\domain\policies\policydefinitions
If you confirmed the adm files which you want to apply has been downloaded to the correct path, you can delete other adm files in other path.
The PolicyDefinitions folder on the Windows domain controller stores all .admx files and .adml files for all languages enabled on the client computer. The ADMX files should be installed on the domain controllers and copied to the “central store”.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best regard,
Daisy Zhou