They should have given you a disk as well. I think it's up to v4.
You can try the following. Not sure if it works or not. You can also use VCDS to find out.
"Get in the car and without turning the ignition on turn on the unit by pressing the ON/OFF button - then press and hold the setup button down for 15 seconds. This will then bring up a 'secret' hidden menu - select 'system' and it will show you the serial number as well as the Software version, map version etc."
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