In case you have your locale set on a culture where decimal separator is not a dot character '.' then method double. Parse in class ServerManager method TestConnection throws an exception. It causes you can not add any server.
 
if (double.Parse(test.Version.Substring(0,4)) < 10.0)

        {
            test.Disconnect();
            throw new ConnectionException("Server version must be at least 10.0");
        }