Silverlight is an old and deprecated framework for videos. Microsoft announced the end of life of Silverlight in 2012 and in 2013 ceased development. Microsoft has set the support end date for Silverlight to be October 2021. It is no longer supported in Google Chrome since September 2015, and in Firefox since March 2017.
https://cfo.arbitersports.com/ needs to get off of using Silverlight for videos as they cannot be viewed in browsers or mobile devices.