> It successes to download relatively small files (about 10Kb-10Mb). But > I feel that if it is more than about 20-30 Mb, it fails while > downloading. Then I have to download it from zero again.
Perhaps your internet connection is getting interrupted during the longer downloads. A workaround might be to use wget. Instead of clicking the link in Firefox, copy the link, enter "wget " in a terminal, and then paste the link: $ wget <paste URL here> If for whatever reason wget gets interrupted and stops downloading, run $ wget -c <paste URL here> in the same directory to continue downloading where you left off.
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