Q: How do I authorise my macbook air to download previous purchased productos from the ibook, app or itunes store?

Move the cursor to the very top of the computer's screen, click on Store, and choose Authorize this Computer.

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evmaggio wrote:

 

How do I authorise my macbook air

On your Computer... Open iTunes...

and from the Menu Bar select Store...

From the Store menu, choose Authorize This Computer.

When prompted, enter your Apple ID and password, then click Authorize.

See Here >  http://support.apple.com/kb/HT1420

evmaggio wrote:

 

... to download previous purchased productos from the ibook, app or itunes store?

Download Past Purchases > http://support.apple.com/kb/HT2519

1. Sign in with the Apple ID that you used for the original purchase. See which Apple ID you used to download an item.

2 )     See if the content is available for redownload. Previously purchased items might not be available if they're no longer on the iTunes Store.