I bought mine through the App Store in February.
They don't give you a key with it, you have to ask on their helpdesk.
Well it was almost two years ago and I'm pretty sure the client I got it through doesnt even work anymore so I'm not sure. I would advise against getting it through the App Store because the updates take several months to get through to the App Store version and the problem with getting a key. BTW I woul advise agains thread necroing.when you bought it from the app store, how did you get your key? I cannot seem to find one with mine.