In LW got to the Library and highlight the incomplete files folder.

You should see your file in there. Highlight it and click resume once only. This should move it back to your download window.
It should automaticly start to resume d/ling.

If it doesn't do a manual search for it.

Do not click the resume or force resume more than once if at all, as this creates a hardship on your systems resources and the G network.