John, the carrera app only works with an ipad or an iPhone or android mobile devices. Why won't it work on a Mac? I have no idea. Some apps are just like that.
From their website:
iPhones from iPhone 4S upward and iPads from iPad 3 upward
Android devices: The availability of Bluetooth® LE is required
The following link lists all the devices that meet the technical requirements for the establishment of a Bluetooth connection with the Carrera Race App:
http://www.bluetooth.com Software compatibility
Android 4.3 upward | iOS 7.0 upward
Android update schedule available online e.g.
http://www.netzwelt.de At the moment the Carrera Race App is only available for iOS and Android devices.
PLEASE NOTE: Carrera AppConnect requires the connection of the PC Unit/Lap Counter to the Control Unit. The Carrera Lap Counter cannot be used at the same time.
http://www.carrera-toys.com/us/products ... anagement/