Impossible to download REALMS

It was always very hard to download my world in realms, because there is no RESUME downloading. It just fails.

 

The last time I upload my world was about 3GB. And cant download now, trying and trying with no success, didnt get to 10% yet and fails and need to start over again. There is any other way do download? FTP, or any kind of RESUME from when it stopped?