How do you connect to Wari?

I actually only want to check what firmware the ecu is running. (and maybe do a backup of the tune as a just in case)
Borrowed a laptop as I only have a mac. We downloaded latest version of Wari, plugged in the USB cable, turned car to ignition.
Opened Wari and the dialog box said something like "no ecu connected"
In Windows Device Manager the computer recognises that the Adaptronic ECU is connected but we cant get past the initial dialog box in Wari.
In the dialog box we clicked "Coms port" and in there there 30odd COM's buttons and a USB button. Selecting USB nothing changed.
In device manager we checked the ECU properties and it said it was using com port 2 so in Wari we selected com port 2 and it said, please connect ecu via serial port?? (we are connecting via the usb port)
By now we were tired so gave up.
Computer is running windows 7. All the usb ports are USB3 not sure if that matters.
The USB cable works fine as I can connect a smartphone to it using adaptive tuner and it reads.
I feel like its something simple but I'm lost.