http://www.mackie.com/products/onyxiseries/drivers/

For those of you who have one of the new Mackie i-Onyx boards, it would be wise and prudent to register with Mackie and get this download while it's free. Mackie was charging for this Pro Tools integration and likely will begin again soon. It doesn't really matter if you use PT or not, the driver doesn't expire and will be needed if you ever change your mind or decide to sell the board to someone who does use PT-M.