iTunes 10 for Windows: Download previous purchases from the iTunes Store
You can download many types of content previously purchased from the iTunes Store to your devices and authorized computers. This way, you can add items to your devices and computers without having to sync or copy files. It’s also useful if your iTunes files are lost or deleted for any reason.
Previous purchases may be unavailable if they are no longer on the iTunes Store.
To download previous iTunes Store purchases to an authorized computer:
In iTunes, click iTunes Store (below Store).
Click the Purchased link in the top-right of the Store home page (below Quick Links).
In the page that appears, select a category.
iTunes shows you which of your purchases are available for download. You can view all of your past purchases, or just the ones not currently in your iTunes library. Items already in your library aren’t available for download.
If you select Music, you can view your purchases by song, artist, or album. If you’re using Album view, click an album to see which songs on it are available for downloading.
To search for an item, type its name or a keyword in the search field, and then press the Return key to view your search results.
To download an item, click the Download button to the right of the item.
To download all available items, click Download All.
You can download previous purchases on a total of up to ten devices and computers, combined. You can authorize up to five computers at a time with an Apple ID.
To find out how to download previous purchases to your iPod touch, iPhone, or iPad, see the documentation for your device.