I wont use this. Im not 100% sure if it will work as in the email it mentions that it is linked to my email. You will need to do the following to input the code.
To get your free copy of R-Type Dimensions on Xbox LIVE, just:
1. Press the silver and green Xbox Guide button on your controller.
2. Navigate to the Marketplace tab.
3. Select Redeem Code. Enter your code.
I will pm the code to the first poster in thread.