Go to your LW Dwnld folder. To know where it is, go to LW's menu Tools>Options>Saving 7 this will tell you the name, location & path of your LW dwnld folder. Now use your OS serch engine & search for this folder. See whether your file had in fact completed & is in there.

If you used Force Resume function from the Library window then yes you risk the dwnld starting from scratch. I don't know why LW has this function b/c it's been discussed on the forum many times before that it can (not necessarily) result in the file starting from 0%. Use your Explore button to view your incomplete folder. List all the files so you can see all their sizes. Are you sure this is the only copy & that it is as small as you suggested?