if you didnt get key go to there facebook website i just got mine :)https://www.facebook.com/NVIDIAGeForce?sk=app_43340181339142...
You will need an Origin account and the Origin client in order to download and participate in the Alpha Trial. If you don't already have an Origin account, simply go to http://www.origin.com
(register using the link on the top right).
Once you have an account, download the client here: http://www.origin.com/uk/download.
Run the downloaded file and follow the instructions to install the client.
Launch the Origin client and Log In to your account.
Select Redeem Product Code from the Origin menu.
Enter the code XXXX-XXXX-XXXX-XXXX in the Product Code field and click Next.
Follow the instructions that appear to complete your code redemption.
You can now select the My Games tab within Origin to see the Alpha Trial. From here you can pre-download and install the Alpha Trial.