Instructions
Visit the Xbox 360 license transfer website (see Resources).
Log in to your Xbox Live account, and click the "Next" button at the bottom of the page.
Turn on your New Xbox 360 and sign in to the Xbox Live account.
Click the "Next" button on the license transfer page. This page lists all of the Xbox 360 licenses you can transfer.
Follow the on-screen instructions to download the licenses to your new Xbox 360.