Content you’ve purchased or installed for free from the App Store and iTunes on your iPhone might not be transferred automatically to the iTunes library on your computer. To make sure all of your media and apps are properly backed up, you can transfer purchases manually before backing up and syncing your iPhone. To transfer purchases to your computer follow these steps:
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Connect your iPhone to the computer and open iTunes.
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Make sure that iTunes is authorized and you are logged into your account. From the top menu choose Store -> Sign In. To authorize the computer for use with your account select Store -> Authorize This Computer.
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From the left menu under DEVICES right-click on the name of your iPhone (Windows) or Control-click (Mac) to display the shortcut menu.
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Choose the Transfer Purchases from iPhone option.
Other easy way is: use software: How to transfer music from iPhone 4s to iTunes library on windows
Good luck!!!
