Posted 04 February 2012 - 12:03 PM
Go to 'Store' in the menu, then 'check for available downloads'.
otherwise, in itunes, to go to the store, then on the right side, click on purchases, then if it isnt even there...
Go to the store, as above, then click on your email address, and log into the store, then half way down there should be an option that says 'view hidden purchases'
IF it still isn't there (i've had this myself), contact apple support, they'll usually get back to you within 24 hours, they'll get you to do all of the above, and finally when none of the above works, they'll do something to reactivate the purchases, which should make things better again... maybe.
That's what they did for me anyway, when only half the songs on some albums i bought showed up in my purchases...