we couldn't quite understand what you were trying to do.
If you have downloaded the complete project from our site there is a trial version of the RadControls for ASPNET AJAX
included in the bin directory. Can you please delete the reference of the Telerik.Web.UI from the references tab of your project settings page and add it again using the dll that you want to use?
If you are trying to create the project from scratch you must download the trial version of the RadControls for ASPNET AJAX that is available on our site.
the Telerik team