http://thiefmodcompetition.com/ Just put in a Name and Email (fake ones if you want), accept the license terms, click submit, and it will give you the Coupon. Then click the Amazon link it has on that page as well, sign in or create an Amazon account, click Buy and Download. Once in there, add the coupon on the right side. Then your total should go down to $0, click Complete Purchase then download it's little downloader. All it will download is a page with your Steam code. Copy it, go into Steam, Games>Activate a Product on Steam, put in your code, and enjoy!