I'm trying to validate my credit card and address to use the Mac app store and it says I should input a valis US credit card and address. I'm from PR I don't have any card or address from US. What should I do?
What is PR?
Change the store to the current geographic location you are in.
I assume PR is the country code for Peurto Rico. Apple do not appear to have any retail store connections there though there are one or two re-sellers.
You need to be living in the USA with a credit or bank card from an American bank to use the US Mac App Store..
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