In this short howto we will use the Microsoft Office 2016 Administrative Template files (ADMX/ADML) on a local PC which do not have an AD join.
1.) Download the Microsoft Office 2016 Administrative Template files (ADMX/ADML) from the Microsoft Website and store them on the non AD joined PC
2.) run the *.exe and let the installer extract the files to C:\temp (create the folder if it didn´t exists before you run the *.exe)
3.) Copy all *.admx files from the folder C:\temp\admx to %systemroot%\PolicyDefinitions\ (e.g. normally C:\Windows\PolicyDefinitions\)
4.) open each language subforder in C:\temp\admx and copy the language files to %systemroot%\PolicyDefinitions\ (e.g. normally C:\Windows\PolicyDefinitions\). If we use an English OS as example you will copy all C:\temp\admx\en-us *.adml to %systemroot%\PolicyDefinitions\en-us (e.g. normally C:\Windows\PolicyDefinitions\en-us)
5.) Now you can run gpedit.msc and change the setting
5.) Reboot the PC to make sure your new policy could be applied
For more infos read: Editing the Local GPO Using ADMX Files