first thanks for your quick answer.....I did not said that I do not see the airport, it was entirely there ground buildings etc.
Ok, I understand, since you said you don't see the Addon Manager, I assumed it wasn't running.
But I could not find the add-on manager to buy actually that scenery. I read in the forum that is is important to buy through the add-on manager.
Like any addon module in FSX, is located under the "Addons" menu.
BTW what happens if I change the hard disk or the entirely machine with this kind of activation?
Nothing, it will just use another activation of the 6 you have available, and if you remember to Deactivate first, it will to consume it so, if you always remember to activate before upgrading hardware or changing to a new PC, you can keep reactivating the scenery forever.