If you find you have reached 5 authorizations, you can reset your authorization count by clicking Deauthorize All in the Account Information screen.
- Click iTunes Store in the menu 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 ID appears on the button), enter your password, and then click View Account.
- In the Account Information window, click Deauthorize All.
Note: You may only use this feature once per year. The Deauthorize All button will not appear if you have fewer than 5 authorized computers, or if you have used this option within the last 12 months.