http://support.apple.com/kb/HT5625
I want to install updates to my Mac, but Mac Store requires a crdit card to register and I don't use one. What should I do?
MacBook Pro with Retina display, OS X Mavericks (10.9.2)
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User profile for user:
mario49
User level:
Community Specialist
Hey hermanocarl,
Thank you for using Apple Support Communities.
You can create an Apple ID without a credit card or change the payment method on an existing Apple ID.
Creating an iTunes Store, App Store, iBooks Store, and Mac App Store account without a credit card
http://support.apple.com/kb/ht2534
Why can’t I select None when I edit my payment information?
http://support.apple.com/kb/ts5366
Have a nice day,
Mario