Visual Studio Extensions for Telerik UI for ASP.NET AJAX are distributed with the Telerik UI for ASP.NET AJAX installer. They can be downloaded and install as separate product from the Visual Studio Gallery only for Visual Studio 2010 and later.
The Visual Studio Extensions can be accessed through the Telerik | Telerik UI for ASP.NET AJAX menu which has different menu items depending on the selected project in Visual Studio. The extensions can be accessed through the context menu of a web project as well.
More information is available here:
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