I wish to install ZA Firewall + antivirus.

I want to know what the differences are between (1) Zone Alarm Free Firewall + Antivirus and (2) Zone Alarm Pro Firewall + Antivirus 2012??

On the surface they seem to have the same functionality but surely the paid for version has some features not present in paid version??

I cannot do comparison between paid and free versions on ZA website.

All help gratefully received.