Extract all files from the archive into the directory with the game.
Run the trainer, run the game. From the main menu, press F1 to activate.
Race Driver: GRID: Trainer (+9) [1.0] Free Download
During the game, with NumLock on, activate the trainer options with the following buttons:
Numpad 1: 999,999 Drift Points
Numpad 2: Kill Race Timer
Numpad 3: $ 100,000,000 Cash
Numpad 4: Unlimited Flashbacks
Numpad 5: Get it in Gear
Numpad 6: Wrecking Ball
Numpad +: Increase Acceleration
Numpad -: Decrease Acceleration
Numpad /: Increase Handling
Numpad *: Decrease Handling
Numpad 7: Steering Damage