I do not see "Authorize my Computer" anywhere on iTunes menu

Authorization and Deauthorization

Macs: iTunes Store- About authorization and deauthorization.

Windows: How to Authorize or Deauthorize iTunes | PCWorld.

In iTunes you use the Authorize This Computer or De-authorize This Computer option under the Store menu in iTunes' menubar. For Windows use the ALT-S keys to access it. Or turn on Windows 7 and 8 iTunes menus: iTunes- Turning on iTunes menus in Windows 8 and 7.

More On De-authorizing Computers (contributed by user John Galt)

You can de-authorize individual computers, but only by using those computers. The only other option is to "de-authorize all" from your iTunes account.

1. Open iTunes on a computer

2. From the Store menu, select "View my Account..."

3. Sign in with your Apple ID and password.

4. Under "Computer Authorizations" select "De-authorize All".

5. Authorize each computer you still have, as you may require.

You may only do this once per year.

After you "de-authorize all" your authorized computers, re-authorize each one as required.

If you have de-authorized all computers and need to do it again, but your year has not elapsed, then contact: Apple - Support - iTunes - Contact Us.

If the computer's running Mac OS X, move the cursor to the very top of the computer's screen, click on Store, and choose Authorize this Computer.

If the computer's running Windows, press the Alt and S keys and choose Authorize this Computer, or click here, follow the instructions, click on Store in the menu bar, and choose Authorize this Computer.

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Depending on where the music is, follow the instructions here or here.

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if my computer is Mac, how do i deauthorize a computer before authorizing?