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

def get_attachment_zip(self, id, project=None, file_name=None, download=None, **kwargs):
        """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
        """
        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)