There is a way, but I am not sure it will work. If it does, it's the easiest way.
1) Make an iso of the digit DVD, and name it EXACTLY -
F-7-i386-DVD.iso Save this file in any suitable location
2) Download the DVD torrent of Fedora 7 from - *torrent.fedoraproject.org/torrents//Fedora-7-i386.torrent
3) Open the torrent in a bittorrent client (e.g. utorrent - *utorrent.com/ for windows), and it will ask you for the location to download the file
4) Direct the bittorrent client to download the file in the same location where you saved F-7-i386-DVD.iso
5) The bittorrent client will check the complete ISO file, and "repair" the "broken" bits- in this case the "broken" bits are the extra files which digit added, because they are not contained in official Fedora 7 DVD torrent.
I'd suggest using this method, as this will give you a bootable DVD iso with the perfect MD5SUM match as the torrent provided by fedora project.
If it does not work, and the torrent client tries to download the complete 2.7gb repeat the same procedure, but this time use the ISO you created (the one which does not boot), and not the ISO of the digit dvd. Follow the steps exactly, especially the naming part. Basically, we are just ensuring that the torrent client checks the existing file, and doesn't start a new download.
Hope that helps