Silverlight 4.0.51204

Microsoft Silverlight is a programmable web browser plugin that enables features such as animation, vector graphics and audio-video playback so you can experience rich Internet applications.
Silverlight offers a flexible programming model that supports AJAX, VB, C#, Python, and Ruby, and integrates with existing Web applications.
It supports fast, cost-effective delivery of high-quality video to all major browsers running on the Mac OS or Windows
download from here
                                                                      Direct Link
http://download.microsoft.com/download/B/A/D/BAD203B3-EF77-469E-9483-E0329590BBC3/wpilauncher_n.exe