I tried a lot of the torrents out there, they kept giving me a xul.dll error. So I'm not sure any of them really work, unless of course you know how to fix that issue. In which case there is a copy downloadable at
http://thepiratebay.se/torrent/6163195/Everquest_Underfoot_%28Steam%29Its 5.89 gigs, so it looks to be the proper size. I myself downloaded it and couldnt get it to work, but It was late and I was having a bad night. So we'll chalk that up to me being a stupid ass.
Also, Hate has a working copy of underfoot. I'm trying to contact him to put it back up because it was taken down because of me. I'm sure if you asked him nicely he would probably put it back up. Sorry to have ruined that option for you, I'm trying my best to smooth that over and get him to place the files for the underfoot client back on his filedump server.
Anywho, try that pirate bay link and let me know how it works out for you. I'm betting upgrading a previous install to underfoot could possibly skip the issues I was having altogether.
Edit: Oh shit there is also a copy fliker posted.
http://thepiratebay.se/torrent/7010148/EZUF.rarI am currently downloading it as well so I can seed it a bunch. so that'd probably be your best bet.
I think you got the version where you have to add in the missing files from titanium or another source i remember having to do something along the lines of that in order to get it to work.