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Are there software tools specifically for ms windows such as file downloaders that can be used for downloading partially downloaded file when url of downloaded file changes?

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I think one of the problems with this is that often there might be tiny changes in the two files. For this to have even a chance of working, both files would have to be exactly the same (same checksum) – joshhunt Nov 12 '09 at 2:19
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3 Answers

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Yes, Pretty much any half decent download manager has this feature.

I have done this with Free Download Manager

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s/descent/decent/ – pavium Nov 12 '09 at 2:39
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and it's actually free – Andrey Nov 12 '09 at 2:46
@Pavium +1 - Thanks... Technical knowledge is my strong point, not spelling! – William Hilsum Nov 12 '09 at 2:55
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up vote 2 down vote

I have not actually tried this but I suppose if wget is used with the '-c' option to continue on a download of the exact-same (say, matching md5sum) file from a different URL, it would continue from an incompletely downloaded file.

Caveats:

  • It is assumed that at least the second server in the above case supports continued download.
  • If the file in question appears to be different at this second server,
    various things can happen (look at the '-c' options detail at the link).
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up vote 1 down vote

I think GetRight will do this. It will automatically search for mirrors, check the size and name of the file, and download from multiple sources. I think you can just add your new file as a source manually and it should do what you want. This program used to be free, I think it still is but I'm not sure.

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It is a paid software – Andrey Nov 12 '09 at 3:31
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