/// <summary>
        /// Gets the download address.
        /// </summary>
        /// <param name="downloadItem">The download item.</param>
        /// <returns>Returns the URI of the download item.</returns>
        private string GetDownloadAddress(IDownloadItem downloadItem)
        {
            var media = new MediaContent { FileSize = 0 };
            foreach (var mediaContent in downloadItem.RssItem.MediaGroup)
            {
                if (mediaContent.FileSize > media.FileSize)
                {
                    media = mediaContent;
                }
            }

            return media.Url;
        }