To see your purchase history, go to Purchase History and sign in with your Microsoft Account (email and password).
Browse for the item that you want to download again, then click Add to queue. This adds the item to your console’s download queue.
Turn on your console and connect to Xbox Live. The item will begin downloading.
Note Downloading previously purchased content to a different Xbox 360 console does not transfer the content's licence. If you want to use content without signing in to Xbox Live, you must transfer the content licence to the console. For information on how to transfer licences, see Can’t play content after console was repaired or replaced.
Redownload content on your console
Sign in to Xbox Live using the gamertag that you used when you originally purchased the content.
Go to Settings and select Account.
Select Download History.
Browse your download history and find the item you want to download again.