Why is my Apple ID was disable from downloading in the App Store

There's a problem with your iTunes Store account information which can't be fixed from your end. Click here and contact Apple Support at a time they're open; if the link doesn't have an option for your country, use this form.

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The answer to the question that you asked, “Why”, is you owe Apple money and they disabled your access to get your attention. You need to contact a real person at iTunes & App Store support to resolve it. There’s a link to do this in this support article→Your account has been disabled in the App Store and iTunes