it didn't work
although the files are still in the incomplete-folder and not renamed as corrupted, they don't appeare again in the search window
i tried to restart the download but it didn't work because there is only one user who has this file and he went offline when i just wanted to restart the download
but before he went offline, it seemed as if the download would have started at 0% again
*sigh*

the strange thing is that at the moment of the crash, only one minor important download was running but all of them are gone now, as it seems