you wait a day or so. Usually, when downloads are interrupted, it's either because of the websites server or line noise. You didn't say if you have problems with dls in general. Most download managers today have what is called 'restart points' where you can pickup the download where it was stopped. But I don't trust them and will start over. Of course the actual download file might be corrupted. If there is a 'mirror' site, try there.

and life goes on...

Jack