Disconnect the Fireface from your computer and double click the rotary encoder button. Check the display for the correct firmware: PC = Windows and AP = Mac. Download RME Fireface 800 Audio Interface Driver 3.30 (Audio/DJ Gear). Double-click onto driverfwmac330.zip to expand the archive file to the folder Fireface330, which includes the driver file Fireface.pkg. Installation works automatically by a double-click on this file.