This new driver, Version 1.0 Build 55 (released October 30, 2013) adds full support for OS X 10.9 (Mavericks). Installer and driver are now digitally signed (which is required by OS X 10.9). Signed driver is installed in /Library/Extensions and unsigned driver is installed in /System/Library/Extensions (for OS X 10.6 and 10.7) as required by Apple.
This new driver removes the ability to control output volumes from Audio/MIDI Setup. If you need this capability, please use Build 54. In anticipation of the Thunderbolt equipped Aurora and Hilo converters, this driver also adds complete support for Thunderbolt hot plug and unplug. Please note that for some Thunderbolt chassis, OS X 10.8.5 is required for hot plug to work properly. The AES16e-50 card default now has the AES50 port routed for all of the inputs.
Please note this will be the last driver to support OS X 10.6 and 10.7. All future driver builds will only support OS X 10.8 and up.
Complete information, download and instructions here: