[updated:LAST EDITED ON 29-Dec-01 AT 02:11 PM (GMT)]Go to the very informative http://www.sathelp.co.uk and follow the link to analogue satellite, there you can get a demo of Pacelink.
PS. Just traced the link and it goes to the Pace site which no longer seems to supply the software. You can try writing to [email protected] who sell the interface and may be able to provide you with the siofware. If not go to any large satellite installer and they may sell you an old version.