This is the ini section which i got from plugh (www.plugh.co.uk) to make redirection downloads possible:

[IpDrv.HTTPDownload]
RedirectToURL=http://69.93.241.XX/~plugh/ut3/
ProxyServerPort=
ProxyServerHost=
UseCompression=False

The trick is (as i understand) to keep order the lines as they are (u'll see it differs with the default order). He also states that he feels that no compression is way faster but that might be the case only for his maps.

Anyways i hope u guys can use it... take care!

Terence.