Aaron's WebVacuum
http://surfware.bizland.com/Awebvacuum.htm
The FREE version available for download is like the full Registered version, except that there is a small, five-second delay between files downloaded (after the first 30 files). The free version does not have a time limit and NEVER expires. The purchase price for the Registered version of Aaron's WebVacuum is about US$26 or less.
I used this for many years before DownThemAll! - I can't honestly remember if Aaron's WebVacuum worked well with this website. I'm thinking there may have been an issue.