The upload window only shows "complete" if the remote host completed a chunk and disconnected from you (because it does not want any more chunks).

If you started a download from one host you can (of course) finish the download from a different host.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob