Thank you for contacting us.
Looking through your account's download history it looks like you downloaded the RadControls for ASP.NET AJAX installer only containing our developer tools (ASP.NET Controls, Visual Studio integration, etc.), whereas you need to our SharePoint web parts installer.
The SharePoint web parts installer is not currently available through our Control Panel application. You can download it (as well as various other product files) through the download list on the "Your Account" page on our website. Here's a direct link for your convenience:
Download RadControls for ASP.NET AJAX Version: 2012.3 1016 (Oct 17, 2012)
the Telerik team