Thank you for contacting us.
The automatic installation of Q2 2012 release of RadControls for Silverlight is for Silverlight 5, but we are still shipping assemblies for Silverlight 4. You can download them separately from your account, please check the following link: Silverlight 4 - DLLs Only
Also in this help topic
you can find more information how to use the dlls only.
Hope this helps.
the Telerik team
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