Telerik UI for WPF demo application can not be launched when there is no internet connection or access to Google Analytics is restricted by DNS. 

In EventViewer you can observe the following error:

Description: The process was terminated due to an unhandled exception.
Exception Info: System.Net.Http.HttpRequestException: The requested name is valid, but no data of the requested type was found. (www.google-analytics.com:443)