Deauthorization fails to allow new authorization
I have deauthorized two old computers but when trying to authorize new one it keeps saying I have 5 computers authorized and I need to deauthorize one.
Windows, Windows 6
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See this article:
Authorize or deauthorize your computer for iTunes Store purchases - Apple Support
If you run out of authorizations, deauthorize all
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.
Good luck!