The easiest way to add past iTunes Store purchases to your iOS device is to redownload them from iTunes in the Cloud.
You can also transfer your purchases from your device to your computer.
Transfer your purchases to your computer
If you purchased content from the iTunes Store on your device using multiple Apple IDs, you'll need to authorize your computer for each one.
To transfer purchases from your device to a computer:
- Connect your device to the computer. Wait for its icon to appear in iTunes.
- Mac: From the menu bar at the top of your computer screen, choose File > Devices > Transfer Purchases from "[device name]".
Windows: Hold down the Control and B keys on your keyboard to open the iTunes menu bar, then choose File > Devices > Transfer Purchases from "[device name]". Learn more about menus in iTunes for Windows.
This feature works only for content bought from the iTunes Store. Any items that you imported from audio CDs or received from other sources won't copy from your device to the iTunes library. However, all podcasts from your device's Podcasts app and copies of all PDFs and books from your device's iBooks app will transfer to your computer. Learn how to transfer media to your iTunes library.
With iOS 9 or later, apps will not sync or transfer to iTunes via Transfer Purchases. If you would like to download your apps to your iTunes library, make sure to turn on Automatic Downloads for your iTunes purchases. You can also download past purchases.
Learn how to move your music to a new computer.
A note about copyright
iTunes software may be used to reproduce materials. It's licensed to you only for reproduction of non-copyrighted materials, materials in which you own the copyright, or materials you're authorized or legally permitted to reproduce. If you're uncertain about your right to copy any material, you should contact your legal advisor. See the iTunes Store Terms of Service for additional information.