I see. Extra bits of fluff do sometimes get appended to files, causing their size and CRC to change from the original. This would cause a download to stick at 99% until a copy of the file with the matching end-block were located.

Is it currently possible to force a partially downloaded file to be moved to the download folder? There could be a "save cancelled download files" preference, or a "cancel download and save file" right-click menu item.