If you found your file is not anywhere near complete, then you can attempt to keep downloading the file. However, sometimes the file never properly completes. Best advice would be to try to find the file from a 'different' source. Also, check with Bitzi (How to use Bitzi Web Lookup) to see user comments about whether the file is good or not. You can only use Bitzi from the search results, not the download window.

The more user comments added to Bitzi, the better for everyone.

(BTW it is possible to revert/show popup answers in your LW option settings -> View > Popups.
Menu bar, Tools -> Options -> View -> Popups for Windows users, or Command & omma keyboard shortcut for Mac OSX users.) ⌘ ,