As per DanyDan in this thread (http://forum.bitdefender.com/index.php?showtopic=28307) BD Antivirus 2012 & Zone Alarm firewall can coexist. But the BD installer forces me to uninstall ZA first. Yes, I can (and did) reinstall ZA after the BDAV install was done. But then ZA has to re-learn all of its "allows" & "blocks".
If only the Firewall of ZA is installed, then the BDAV install should be allowed to continue. If the BDAV installer cannot determine which ZA component is installed, then it should provide an option to bypass the ZA removal if the user can verify what ZA he has.
I will likely install BDAV2012 on a few more machines that also have the ZA Firewall. I would prefer not to have to reinstall ZA and put the end users through the inconvenience of ZA's "learning" (they don't always know the correct responses, and they consider it a nuisance).
Please update the offline installer package, as well, to accomplish the above.