I misunderstood... Since you reported having CS2, I assumed you could diagnose your own problem.
It does not matter that you are running Elements on a Mac. Actions (in general) will work on either platform.
The reason this action will not run under Elements is Elements does not support the
Curves command.
In Photoshop you could try to achieve a similar effect by replacing the Curves step in the action with some combination of Levels and Hue/Saturation adjustment layers (set to "colorize") and layer blend mode settings. This will take a little experimenting on your part to come up with the right combination, but that is half the fun!
Once you get the new action working in Photoshop on the laptop, save it as an .atn file and install the .atn on the Mac as you normally would.
Is this enough information?