/// <summary>
        /// Downloads the .nupkg file of a Package.
        /// </summary>
        /// <remarks>
        /// Required permissions: Packages.View.
        /// </remarks>
        /// <param name='operations'>
        /// The operations group for this extension method.
        /// </param>
        /// <param name='key'>
        /// </param>
        /// <param name='cancellationToken'>
        /// The cancellation token.
        /// </param>
        public static async Task <Stream> DownloadPackageByKeyAsync(this IProcesses operations, string key, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken))
        {
            var _result = await operations.DownloadPackageByKeyWithHttpMessagesAsync(key, null, cancellationToken).ConfigureAwait(false);

            _result.Request.Dispose();
            return(_result.Body);
        }