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Nov 16, 2015 4:26 PM in response to Eri84by Limnos,The OWC or Mac-sales.com web site has good instructions for upgrading RAM. You are not specific about your year and exact sub model MacBook so can't tell if it is even possible to run OSX 10.8.5 or higher required to install the newest iTunes. You can look up OSX upgrade possibilities by tracking down your exact model computer and specifications on the everymac.com web site.