I want the free upgrade to OS X El Capitan
First time using App Store
Reviewing my address, why is compulsory to add a payment type if the upgrade is free and I'm not planning to buy anything at the present?
How can I access to App Store without giving my credit card details?
iMac, OS X Mountain Lion (10.8.4), 2.7 GHz Intel Core i5 8GB 1600MHz
