Yes! Duet FireWire is fully compatible with Mac OS Mountain Lion (10.8). If Duet FW August 2011 software was pre-installed before updating to OS 10.8 Mountain Lion, it is not necessary to install any new Duet software.

 

The Duet FireWire July 2012 release is intended for NEW Duet FireWire installations on Mac OS 10.7 Lion and 10.8 Mountain Lion.

Download July 2012 Software Installer (Mountain Lion Compatible)