code: def get_attachment_zip(self, id, project=None, file_name=None, download=None, **kwargs):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if id is not None:
              route_values['id'] = self._serialize.url('id', id, 'str')
          query_parameters = {}
          if file_name is not None:
              query_parameters['fileName'] = self._serialize.query('file_name', file_name, 'str')
          if download is not None:
              query_parameters['download'] = self._serialize.query('download', download, 'bool')
          response = self._send(http_method='GET',
                                location_id='e07b5fa4-1499-494d-a496-64b860fd64ff',
                                version='5.1-preview.3',
                                route_values=route_values,
                                query_parameters=query_parameters,
                                accept_media_type='application/zip')
          if "callback" in kwargs:
              callback = kwargs["callback"]
          else:
              callback = None
          return self._client.stream_download(response, callback=callback)
docs: GetAttachmentZip.
          [Preview API] Downloads an attachment.
          :param str id: Attachment ID
          :param str project: Project ID or project name
          :param str file_name: Name of the file
          :param bool download: If set to <c>true</c> always download attachment
          :rtype: object