code: func newDownloadQueue(manifest *tq.Manifest, remote string, options ...tq.Option) *tq.TransferQueue {
  	return tq.NewTransferQueue(tq.Download, manifest, remote, append(options,
  		tq.RemoteRef(currentRemoteRef()),
  	)...)
  }
docs: // newDownloadQueue builds a DownloadQueue, allowing concurrent downloads.