I too have the keyboard - with a Pearl 8100 - and am not clear on how to install the drivers. The package has a Mac Icon but the instructions indicate that one MUST have Windows and Blackberry 4.0 (Windows only software) to install the driver. It appears that the driver needs to be downloaded and then during the install an unlock code is provided (as best as I can understand their poor instructions).
How did you get the driver installed on a Mac and did you get it unlocked?
Maybe together we can work this through.