Things You'll Need
Instructions
Select "Xbox Live Arcade" from the Xbox main menu. The main menu can be reached by turning the console on without a game inserted into the disc drive.
Select a genre of game from the Xbox Live Arcade menu.
Choose the title of a game to bring up the menu for that game.
Choose the full game or demo download option. The price of the full game will be displayed in the game information.
Select the "Download Now" option. You will be prompted to confirm you want to purchase the game if you select the full game download.