@nancledra53 If you look in your client and see "Error: unregistered torrent" or similar in the status column then that torrent has been deleted. That's your notification. 🙂
All is not necessarily lost though. If the remaining swarm contains any seeders (or enough leechers with all the individual parts) you still have a chance of completing the download. When a torrent gets deleted from the site it stops anyone new from joining the swarm, but it has no ill effects on an existing swarm. It doesn't happen very often as people usually kill the download as soon as they see it's been deleted, but I've managed to finish a few files this way in the past. My advice is to keep them running in your client for a week or 2 if you can just to give them a chance.