Questo presuppone che tu abbia già caricato il pacchetto iniziale & ho bisogno di quelli che erano i 3 "Jam Pack" aggiuntivi ...
Considereresti 5 dollari ne vale la pena, per rimanere su Garageband 10?
menu GarageBand > Scarica altri suoni
Se in precedenza hai acquistato questo contenuto, seleziona Ripristina acquisto per installare il contenuto
[Non sono sicuro che "acquistato in precedenza" includa l'acquisto di iLife, ma varrebbe la pena di provarlo]
Fonte: Apple KB - Espansione del contenuto di GarageBand per Mac (v10.0) con un acquisto in-app
In alternativa, se non hai già caricato il primo Jam pack, questa potrebbe essere una soluzione ...
Open GarageBand and either create a new project or open an existing one (don’t worry, we won’t be making any edits to the project).
Navigate to the Loops section by clicking on the Loops button in the lower right corner of the application.
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Next, you have to find a Loop that GarageBand knows exists, but has yet to be downloaded. It appears Apple let GarageBand know that there are other Loops in existence that were not opted to be included in the base install of the application.
The easiest way I’ve found to do this is to first Click on the “Rock/Blues” category to narrow the number of Loops displayed, and then find the “70s Ballad Drums 01”; which will appear slightly greyed out and its icon will be an empty box with a dashed border.
Double-click on the missing Loop, and a rather large (and semi-confusing) dialogue box appears. In short, you want to select the “Download Now” option and click OK.
Next, you need to open the App Store application and navigate to the Updates tab. Once there, you will find the ‘Update’ to GarageBand nestled under Software Updates for OS X. It is entitled “GarageBand Instruments and Apple Loops 1.0”.
Even though the large dialogue box in GarageBand said the update would be downloaded “now”; when I went through this process it did not automatically start the download. This may be due to how I have automatic updates turned off on my machine (for development reasons); so it may have already started downloading for you at this point, but just make sure the 'Update’ is downloading and you’ll be good to go!
One quick thing to note: you will have to quit and reopen GarageBand before you can start using the new software instruments and Loops that were downloaded.
Fonte: Come aggiornare GarageBand con quasi 1.000 strumenti e loop gratuiti!