Ver. 3.5.57173.439 wants to downld new CAV/frwll. R trusted sites trnsfrrd

Have above version. CAV was not available for Vista at time of initial download. I need to download free firewall/defense+/antivirus to have the now available CAV. If I do so, will my trusted sites/programs etc be migrated to the new downloaded version? If not, how do I download just CAV and have it appear in the Comodo firewall screen?