This giveaway is courtesy of the Square Enix Store
1. Go here
2. Enter your birthday (Make sure you are older than 18)
3. Add the game to cart and click checkout
4. Register and log in (Enter a valid e-mail) or you can use Facebook
5. When you are reviewing and confirming the order, you must click "If you have a promo code"
6. Enter promo code: FreeSilentAssassin
7. Continuing with the checkout process, you must enter a valid US address (Find one online)
8. When you receive the e-mail, click on "Click here to get access to your products"
9. Unlock the activation key and the Steam key will appear