Alan for some reason it seems the latest ZA free version 8.x now trips the Compatibility check in avast!, so the work around that avast has in place to try to identify the ZA free from the ZA Pro would appear not to work in this latest ZA version.
Well, the proof of the pudding ...
I just installed Zone Alarm free version 8.0.065 on this system and the system has been restarted several times. It did not trip the compatibility check in avast.
A couple of thoughts come to mind:
1) the default recommended offering from ZA even when the "free version" is selected is to give you the Pro version with a 15 day trial. You can say you just want the free version without the Pro trial. So folks taking the default install are getting the Pro version.
2) as I said a few days ago:
As I recall anyone with an avast install predating 25 September 2006 is likely to get this ZA warning from avast for all eternity (or until avast is reprogrammed - whichever comes sooner).
avast installs after that date apparently make an automated decision on the "compatibility" issue with ZA.
I did a complete removal of avast and a completely fresh avast installation on this system in the middle of the most recent beta program - so my installation looks nice and new.
Ok - now time to take my system back 30 minutes so the ZA install never happened.