Skygo (streaming using Silverlight) doesn't work anymore since update to OS Yosemite with Safari

Hello everbody. Since I updated my OS to Yosemite, skygo.it doesn't work anymore. I installed Mozilla firefox and with this browser it works but I'd like to use safari as my only browser. The website skygo.it is a video streaming site (life and on demand) and it uses Microsoft Silverlight.

Thanks for your help.