Hi Andria,
If you have a tool of some kind to manage the database, you can go into the mp_SharedFiles table and directly edit the DownloadCount field on any row. Each file is represented by a row in the table. There is no seed number per se, when you upload a new file it creates a row with a default value of 0 for the DownloadCount but you could edit that value after the row exists.
Hope it helps,
Joe