ZoneAlarm plans is giving out one of it’s product called Zone Alarm Pro for free on 13th October. They did the same thing last year.
It is on now and will end in a few short hourshttp://download.zonealarm
For what it is worth, when I used Firefox 3.5.3 I could not successfully submit the details they asked for on the form on their site.
I switched to IE8 and a somewhat different and much simpler webform came up just asking for name and email and I received the registration details about an hour later.
So I would suggest using IE8 instead.