I have an old Desktop Mac, I'm having trouble booting up, so I cannot de-authorize it. I have a new MacBook Pro which I cannot authorize, how can I solve this, as I need to clear something to authorize the new computer.
iMac 27″, macOS 10.15
"Deauthorize All" and then authorize any computers you still have and want to use. See the following from Authorize or deauthorize your computer for iTunes Store purchases - Apple Support
If you need to deauthorize a computer that you don't have access to
To deauthorize a computer that you don't have access to, you have to deauthorize all of your computers. Then authorize each computer that you have again. You can deauthorize all computers only once a year.
"Deauthorize All" and then authorize any computers you still have and want to use. See the following from Authorize or deauthorize your computer for iTunes Store purchases - Apple Support
If you need to deauthorize a computer that you don't have access to
To deauthorize a computer that you don't have access to, you have to deauthorize all of your computers. Then authorize each computer that you have again. You can deauthorize all computers only once a year.
Deauthorize Old MAC
