Hello Lee,
Sorry, I'm not that au fait with all this stuff - I was hoping it would be more plug and play than it is (especially looking at the very learned stuff on this forum, most of which I don't understand). Email I gave you at the LAA Rally on Saturday is dh87b(at)iCloud.com. I think this is the right mac address: B827EB407852. The one I gave earlier is for my iMac! Forgive me for being confused.
So very simple, go to this web address
http://pilotaware.lode.co.uk/Select top option
'1st Year System Key'Accept the terms, by ticking
I have read, understood and accept the license terms above (accept to continue)
enter your name, press return
enter your email, press return
enter your mac address (as above B827EB407852), press return
now you will receive an email containing your license code, this is entered on your configure page of PilotAware
then you should be running
Let me know if you get stuck, and if so at what stage