duplicator download problem

When i want to download i cant make it.

Archive file size warning.
The expected archive size should be around [411.72MB]. The actual size is currently [247.56MB]. The archive file may not have fully been downloaded to the server. Please validate that the file sizes are close to the same size and that the file has been completely downloaded to the destination server. If the archive is still downloading then refresh this page to get an update on the download size.