Deauthorize old computer
How do deauthorize a computer that I no longer have access to?
Windows, Windows 6
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See the instructions in Authorize or deauthorize your computer for iTunes Store purchases - Apple Support
including the following:
If one of your 5 authorizations is on a computer that you don't use anymore, deauthorize it. If you sold or gave away a computer that's used one of your 5 authorizations, you need to choose Deauthorize All on the Account Information page. Then authorize each computer that you still use.