1) Go here: http://thiefmodcompetition.com/
2) Fill out name and email (you can use a fake name and email)
3) Get Amazon code for Thief Gold
4) Go here: http://www.amazon.com/Square-Enix-Thief-Gold-Download/dp/B009IXL5FO/ref=dsvrt_myd_asin_block
5) Click Purchase
6) Apply Amazon code from Step 3 to bring price to $0.00
7) Buy game for $0.00
8) Get Steam key from Amazon library: https://www.amazon.com/gp/swvgdtt/your-account/manage-downloads.html?ie=UTF8&ref_=dsvrt_hyd_your_d
9) Redeem on Steam
You're welcome.
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Got it. Yippie!