After a massive retuning and reinstalling work on my Mac's HD, I launched my electronic-downloaded version of Metro SE and it asks to qualify to start.
I will connect to the Net and type the right answer and everything should be fine.
However I'm planning to buy a new Mac and reinstalling Metro on it will probably require a new requalifying process (it will be the third time).
So I'm asking how many times can anyone qualfy Metro before his licence will become invalid.
Sorry for my english.