The problem is you are confusing downloading the contents of the torrent with downloading the .torrent file. You can always download the .torrent files for your own uploads, even without download rights. The most common cause of this problem is that you have not moved the contents of the torrent to the folder where your torrent client downloads to by default. Remove the torrent from your torrent client, copy or move the contents of the torrent to the folder where your torrent client downloads into by default, THEN add the torrent to your torrent client, and it should begin seeding your upload.