If it makes things any easier, LibriVox has the audiobook. As with all LibriVox offerings, it's a free download, produced and read by LibriVox volunteers.
http://librivox.org/ivanhoe-by-sir-walter-scott/
Zip file of the entire book(533MB):
http://www.archive.org/download/ivan...x_64kb_mp3.zip
All files are public domain in the USA.