Try WGET for windows. Use google, I Don't have straight link.
It doesn't need a installer, you just run the command.
One problem with AD can be, that there is firewall blocking ftp-traffic, or limiter for big amounts of traffic to certain IP
Torrents would need a program installed.
Edit: You have no problems with FC4 and slack, hmmm.. Ok then only help I can give you is to try different mirrors. PLEASE don't use any of the main servers, they are always full, and speed is really slow.
FTP MIRRORS FOR EVAL
Hope you find a server for you...