If someone has the entire file, they could "email" it to select persons.
Through a PM on this site to a longer term poster, you could use an online service to send the file to and from an anonymous free email account, by using a free file-transfer service.
Here is one way.
[
www.spread-it.com]
Whoever has the file uploads it, and then sends the link to someone else, and they download it direct.
Or it could be stored on something like www.esnips.com in a new account, and then shared like that.
That should get the torrent started.