Things You'll Need
Instructions
Downloading from Xbox Live Marketplace
Sign into Xbox Live using your gamertag by pushing the Guide button on your Xbox 360 controller and selecting the "Profile" option. If you cannot sign into Xbox Live, check your online connection and try again.
Scroll left to the Marketplace tab on the Guide window, and select "Game Marketplace."
Scroll down to "Games on Demand" and select this option.
Scroll down to "All Games on Demand," and select the "Browse Xbox Originals" window.
Scroll through the list of available original Xbox video games by alphabetical order or by genre.
Select a video game to purchase and choose the "Buy" option.
Select "Confirm Download." Your video game will begin to download to your Xbox 360 memory device, and your account will be deducted the Microsoft Points.