Starting with Java 8 Update 20, the Medium security level has been removed from the Java Control Panel. Only High and Very High levels are available.
The exception site list provides users with the option of allowing the same applets that would have been allowed by selecting the Medium option but on a site-by-site basis therefore minimizing the risk of using more permissive settings.
The execution of Winlog Web Client requires the Medium security level. For this reason, to run the Web Client Demo, you must add the following exception to the Java Control Panel (Security) in the site list: http://webdemo.sielcosistemi.com:81/
After you complete these preliminary steps, you can download and run Winlog Web Client from this link.