Thank you for your interest in the RadUpload for Silverlight.
Till now we do not have a download
control. In fact you do not need such a control. You can setup a virtual directory on your web server - all requests to this directory will return files from your directly on D-drive. Other way is to implement your handler that will return the file specified in the request.
We hope this information will help you.
All the best,
the Telerik team