If you don’t already use a Central Store and ADMX files for managing Group Policy, installing and configuring the Office 2013 ADMX files in a Central Store will prevent you from being able to manage the default Admin Templates, like System, Control Panel, etc. You will also need to install the Server 2008 R2 Administrative Templates as well to restore this functionality. These can be downloaded from here: https://www.microsoft.com/en-us/download/details.aspx?id=6243.
Follow the instructions from here to install
Download the Office AMDX templates from: https://www.microsoft.com/en-us/download/details.aspx?id=35554
The architecture doesn’t matter, as the ADMX files and ADML files are identical.
Extract the relevant file to a temporary location.
Create a folder in %SYSTEMROOT%sysvoldomainpolicies called policydefinitions
Copy the ADMX files from the temporary location to the policydefinitions folder
Copy the language folders (containing the ADML resource files) of the languages you wish to use from the temporary location to the policydefinitions folder
Open Group Policy Management. Create a new policy object. Under both Computer Configuration and User Configuration, the Office 2013 Administrative Templates are now available.
The above process and additionally be used for any ADMX templates.
To install the Server 2008 R2 / Windows 7 Administrative Templates, download them from: https://www.microsoft.com/en-us/download/details.aspx?id=6243
On the server, open the %systemroot%sysvoldomainpolices folder.
If the PolicyDefinitions folder doesn’t exist, create it.
Install the Server 2008 R2 / Windows 7 Administrative Templates to either a workstation or the server.
Once installed, navigate to the location you installed them to (default c:program files (x86)Microsoft Group Policywin72008r2).
Open the PolicyDefinitions folder.
Copy the ADMX files to the %SYSTEMROOT%sysvoldomainpoliciesPolicyDefinitions folder
Copy the language folders (containing the ADML resource files) of the languages you wish to use to the %SYSTEMROOT%sysvoldomainpoliciesPolicyDefinitions folder