Installing Web Browser Extensions Using Group Policy
To install web browser extensions using group policy follow instructions below:
Unzip the ITHitExtensionsInstall.zip file and copy the .admx files and the en-US folder to the %systemroot%\PolicyDefinitions folder on your Active Directory or RDS host.
On the Active Directory host, open the Group Policy Management Editor.
On an individual RDS host, you can open the Local Group Policy Editor with the gpedit.msc utility.
Go to User Configuration > Administrative Templates > Install IT Hit Browser Extensions.
Go to every policy with the extension and enable it.
See also protocol application automated installation instructions in Protocol Application Installation on Windows article.