Markoz wrote on May 16^th, 2014 at 2:30am:

All I had to do to activate Acceleration, was enter the serial number and click on Activate. You need to make sure that you are entering the serial number exactly right, no mistaken letters/numbers. A 0 (zero) can often be mistaken for an O. :-/

oh really? In case it actually haven't provide anywhere to let me to type in the key, I don't know why. And after that have an error before I load in FSX menu, but the error didn't effect I play with FSX, now it just make me cannot play so long time, maybe 20mins then the FSX need me quit the game :-/ :-/