Well, after 99 reads of my original post, and absolute lack of support from other users, Hot Start, and X-aviation, I have decided to stop further purchases from this site. I guess, asking for a refund will be a waste of time.
In order to avoid frustration and anger to future customers, please consider seriously -especially if you are Mac owners- purchasing this plane if you do not want to loose 60 euros. At least I did not take the risk of getting, as I was thinking of, the Challenger.
Extremely disappointed with the customer service.
Good bye!