I just purchased a new iMac which has iTunes 11 installed. How can I download all the iTunes songs I have purchased since 2008? Do I need to de-authorize my previous computers and authorize the new iMac?
iMac (21.5-inch, Late 2012), OS X Mountain Lion (10.8.2)
"How can I download all the iTunes songs I have purchased since 2008? "
Downloading past purchases from the App Store, iBookstore, and iTunes Store
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Do I need to de-authorize my previous computers and authorize the new iMac?"
You will need to authorize the new computer.
iTunes Store: About authorization and deauthorization
Go to the iTunes Store, log into your account, and click the Purchases link under the Quick Links. From there you should be able to re-download some or all of your purchased content. Note that not all content has been licensed for re-downloading in all countries at this time. You can see what content you can download here:
http://support.apple.com/kb/HT5085
For full instructions, see:
http://support.apple.com/kb/ht2519
Regards.
Downloading all previously purchased iTunes
