They are quite clear in stating they don’t support anything prior/older. The requirements are pretty simple as it works with Intel/PPC processors from Tiger to Snow Leopard. Prior to even downloading the downloadable installation check over the System Requirements page ( ) to verify that the target system is up to par with what the software supports.

Note: It is very important to be sure to backup your system with Time Machine or alternative backup software (Carbon Copy Cloner) prior to installation and after verifying you have the requirements necessary to install and run adequately. It’s also offered with it’s PC version for a discounted rate. It comes in a variety of subscription flavors starting at 1 Year. This software is not free, however they offer a free 60 day trial version to download from their website. The software offers the following features: Avast! Mac Edition is an Antivirus software for Mac.