Hello Basel Nimer,
No, there is no stand-alone DLL for the rating control. The only way to use our control, is to upgrade to a version of the Telerik.Web.UI assembly that contains the code for the rating control. Before you upgrade, you can refer to our documentation are review the Changes and backwards compatibility sections for the controls you use. For example, you can find the topic for RadSlider here: http://www.telerik.com/help/aspnet-ajax/changes_and_backwards_compatibility.html
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