No, don't write off what you've already downloaded! Just head to Giganews (as but one example), and use their short-term trial period. They'll let you d/l about a gig (or so) over three days, for free. Just be sure to cancel after those three days. This is all on the up-and-up, too. From Giganews' site:

Free 3-day Trial
All new Giganews personal accounts come with 3 days of free service (up to 1GB total transfer). If you cancel by 12:01am CDT (UTC-0500) on 07/12/2005, you will be charged nothing. If you do not cancel by 12:01am CDT (UTC-0500) on 07/12/2005, the service level you select below will automatically start and you will be charged for that service.

This offer is only good once, and is not available to current Giganews account holders.

There is no way you're missing a whole gig, so this should work perfectly for you.