Found it!For anyone else having the same issue - I was using Google Chrome and when you accept the licence agreement on the Adobe website, the next page does not appear. However, if you use Internet Explorer, the next page does appear and it contains the serial code.Maybe something for the Adobe web...

Hi,I have downloaded the LiveCycle ES3 trial however when I go to install, I am asked for a serial number and cannot proceed until I have entered one.I can find a serial number for the ES2 trial but it doesn't work with ES3 and I cannot find one anywhere!Any help would be greatly appreciated.Thanks.