Go to the Fable 3 listing on the Xbox Live Marketplace by clicking http://marketplace.xbox.com/en-US/Product/Fable-III/66acd000-77fe-1000-9115-d8024d5308d6?cid=SLink
Click the "Download to xbox 360" button. / Buy Game opttion
Game will be priced $19.99
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Click the "use microsoft points" option...