Log into ISL Conference Proxy server as administrator. Administrative page is located at: <IP_of_your_server>:7615/conf
Select Online update on the left side of the administrative page.
Select "Default (install latest)" or "Install latest" from the Authentication dropdown menu.
Click Apply Changes and wait for the updates to be installed.
After the installation is complete, a new folder, named authenticator, will appear in ISL Conference Proxy installation folder.