In order to use the Microsoft Office 2013 ADMX Templates with Desktop Authority Group Policy Templates object, download the ADMX files from Microsoft using the link below:
Microsoft Office 2013 ADMX Template Files
After downloading, they can be imported to configure the desired settings in the Group Policy Templates object. The following link contains the process regarding how to import ADMX template files to the Group Policy Templates object:
Importing ADMX Template Files to Group Policy Templates object
