If a download fails eg if the host goes off line or if you terminate a download your self the incomplete file resulting (it may be zero in size) can be seen in your library in the incomplete folder. A broken icon indicates that you have part of that file(possibly of no size) and if you go to download that file again, it should restart your incomplete file from where you left off. Whether this will prove as successful as trying a fresh download of another copy of the file, is a gamble, but I tend to find the broken icon files, when they appear, recommence fine as a rule.

~I hope this makes sense and helps

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