code: def download_package(self, feed_id, group_id, artifact_id, version, file_name):
          
          route_values = {}
          if feed_id is not None:
              route_values['feedId'] = self._serialize.url('feed_id', feed_id, 'str')
          if group_id is not None:
              route_values['groupId'] = self._serialize.url('group_id', group_id, 'str')
          if artifact_id is not None:
              route_values['artifactId'] = self._serialize.url('artifact_id', artifact_id, 'str')
          if version is not None:
              route_values['version'] = self._serialize.url('version', version, 'str')
          if file_name is not None:
              route_values['fileName'] = self._serialize.url('file_name', file_name, 'str')
          response = self._send(http_method='GET',
                                location_id='c338d4b5-d30a-47e2-95b7-f157ef558833',
                                version='5.1-preview.1',
                                route_values=route_values)
          return self._deserialize('object', response)
docs: DownloadPackage.
          [Preview API] Fulfills maven package file download requests by returning the url of the package file requested.
          :param str feed_id: Name or ID of the feed.
          :param str group_id: GroupId of the maven package
          :param str artifact_id: ArtifactId of the maven package
          :param str version: Version of the package
          :param str file_name: File name to download
          :rtype: object