As you legally purchased the game, there's nothing wrong with torrenting the install disk, which is your only choice here. SE has not put up any way of downloading the client.
Edited, May 19th 2011 8:40am by jameskilton
Not strictly true, and torrenting runs two risks:
1) While as an original purchaser you are allowed by law to own a backup of any media you purchase, you cannot distribute it. If you get a torrent, the downloading of the disk is fine but the uploading (the whole point of torrenting) is illegal.
2) There is no control over the content of the torrent you are downloading. It might be that Mr NiceGuy has ripped his disk and made it available to people in your situation. It might be that Mr NastyMan has ripped his disks, then crammed as much dodgy software into it as he possibly can. You have no real guarantees which you will get.
While these are mild risks, they are risks none the less.
To endanger the soul endangers all,
when the soul is endangered it must become a Warrior.