32bit / 64bit refers to the architecture of the Office, not the Operating System.
Office 2013 Administrative Template files (ADMX/ADML) and Office Customization To
Office 2013 Administrative Template files (ADMX/ADML) and Office Customization Tool 32bit
Office 2013 Administrative Template files (ADMX/ADML) and Office Customization Tool 64bit
Office 2016 Administrative Template files (ADMX/ADML) and Office Customization Tool
Office 2016 Administrative Template files (ADMX/ADML) and Office Customization Tool 32bit
Office 2016 Administrative Template files (ADMX/ADML) and Office Customization Tool 64bit
Download the relevant files and run it, it’ll decompress to a location of your choice.
If using the templates in a domain enviroment (highly likely?) the navigate your way to \\YOURDOMAIN.LOCAL\SYSVOL\YOURDOMAIN.LOCAL\Policies. If a PolicyDefinitions directory doesn’t already exist, create it.
Copy the admx\*.admx files to \\YOURDOMAIN.LOCAL\SYSVOL\YOURDOMAIN.LOCAL\Policies\PolicyDefinitions
Copy the admx\en-us to \\YOURDOMAIN.LOCAL\SYSVOL\YOURDOMAIN.LOCAL\Policies\PolicyDefinitions
Open GPMC and navigate to User Configuration -> Polices -> Administrative Templates
Examples…