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How to copy purchases between computers.
You can download items once when you purchase them from the iTunes Store. To use purchased items on a different computer, just copy the items and authorize that computer. You can authorize up to five computers to use your purchased items.
If you will no longer be using the computer you originally downloaded your purchases to, make sure to deauthorize your computer.
- Click iTunes Store on the left side of iTunes.
- If you're not signed in to the store, click the Account button, then enter your account name and password.
- Click the Account button again (your Apple ID appears on the button), enter your password, and then click View Account.
- In the Account Information window, click Deauthorize All.