To use them, you need to contact wildpacket cust svc/support directly. Don't bother with the online form. Let them know why you need it and they will send a link that's good for ~60 days. If if you have never used a protocol analyzer, you'll be impressed.
they set me up for only 30 days!, and I called over 6 times to get some sales guy to send a link... if you are a student then you need to use your student email with the online form. but 30days is better than only 3 days with airmagnet... AHHHHHH Fluke!