first connect to xbox live then to get to the game addons, games, trailers, ect go to the game section on the dashboard and find the tab. For music go to the music section and for movies go to the movie section.... its really not that hard to find :)
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To redeem a Xbox game code you need to go to the marketplace. From the marketplace you click on redeem code.
Yes it is
This error is unknown to Xbox support website. The error similar to that is a marketplace error, downloading files and other things within the marketplace.
You'll have to purchase it from the Xbox Live Marketplace and download the game to your console.
You can download it in the video marketplace.