wget is a very good utility to download large files or iso images.
When downloading large file or DVD iso, you can use wget -c ‘url to iso file’ which you can resume download from where you left last time.
Sometimes there are scuh links which keep a lot of garbege, and using wget -c ‘url to iso file’ causes a new thread a new download instead of resuming.
In such a case you can use wget -c ‘url to iso’ -O my-dvd.iso
Using -O file name downloads file with file name and always can be resumed.
Anuj