HT201812: Find and remove duplicate items in your iTunes library
Learn about Find and remove duplicate items in your iTunes library
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Helpful answers
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Apr 20, 2015 9:10 AM in response to arutnev1950by Limnos,Simply downloading won't erase anything. Did you install too? If you installed too then normally it also should not affect the library but sometimes for strange reasons it does which is why you need to do a computer backup before installing any updates of any kind. Do you have a backup?
iTunes: How to re-create your iTunes library and playlists - http://support.apple.com/kb/ht1451