With Q3 2012 we discontinued support for Silverlight4 as explained in the related blog post. You can download the latest version shipping binaries for Silverlight 4 (2012 Q2 SP2 ) here.
I hope this helps.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for SILVERLIGHT.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>