The game developers decided to add hundreds of Steam anti-cheat triggers to the single player game.
This is the reason why it was retired. Due to the ammount of work that would needed to make the trainer with the new changes then any subequent updates would probably take the same length of time. Which then would double the amount in cost to download ratio.
A work around is there where you can use the no-cd fix with the original trainer.
F1 2013 is Perma Banned and wont be untired. Sorry of the inconvenience but as it stands the only way for you to play the game is to use the no-cd fix with the original trainer. Turn the game updates off and play in offline mode.
[Edited by Toki, 3/30/2014 11:54:33 AM]