USB orangutang Drivers not installing on MAC

Ah. Scott Edwards makes a lot more sense than Scott Adams for this kind of product. Anyway, you did not say how you connected it, but yes, the USB-to-serial feature of the Orangutan Programmer is non-inverted serial, and it looks like you need inverted serial. You could add your own inverter, but it would probably be easier to just get a standard USB to RS-232 adapter. There is no way to invert serial on this device.