iTunes - Automatically download content purchases made from the Store

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You can configure iTunes to automatically download the purchases (apps, books, music) made from the App Store, iTunes Store....
The procedure is as follows:
  • Open iTunes and sign-in using the Apple ID (used for the purchases).
  • Click on the Store menu > Authorize This Computer (Apple ID required).
  • Click on the Edit menu > Preferences > Store.
  • In the Automatic Download section, check the following items:
    • Music
    • Apps
    • Books
  • Click on Ok to validate.

The procedure for iOS is explained here: