You click "Get" or "Buy" on an app in the Mac App Store, and instead of the download beginning, a small dialog box appears: "We could not complete your purchase. An unknown error occurred (Error Code 1033)." Or you might see a similar message during a macOS update attempt.
Mac Error Code 1033 is an account and billing verification error generated by the App Store. It signals that Apple's servers attempted to verify your Apple ID account and payment information before processing the download or purchase, but something in that verification chain failed.
Fortunately, this is an entirely software-side error with no hardware implications, and it is usually resolved quickly by addressing your Apple ID and payment settings.
What Causes Error 1033?
The App Store runs a quick account verification check before every download — even for free apps. Error 1033 fires when this verification fails due to:
- Outdated or expired payment method: Your credit card on file with Apple has expired, been declined, or has billing address information that doesn't match Apple's records.
- Unpaid balance or outstanding charges: Apple has a pending charge on your account (from a previous purchase or subscription) that couldn't be processed, putting your account in a restricted state.
- Stale authentication session: Your Mac's App Store session token has expired and needs to be refreshed with a fresh sign-in.
- Country/Region mismatch: Your Apple ID is registered to a different country than the App Store you are trying to purchase from.
Step 1: Check and Update Your Payment Method
This is the most common cause of Error 1033. An expired or declined card will cause Apple's verification to fail on every download attempt.
- Open the App Store app on your Mac.
- Click on your account icon in the bottom-left corner.
- Click Account Settings (you may be asked to sign in).
- Under the Payment Information section, review your payment method.
- If your card is expired, click Edit and update the expiry date, CVV, and billing address. Or click Add Payment Method to add a new card.
- Save the changes and try your App Store download again.
Step 2: Sign Out and Sign Back In to the App Store
A stale authentication session is the second most common cause. Signing out forces the App Store to generate a fresh token with Apple's servers.
- Open the App Store.
- Click on your account icon in the bottom-left corner.
- Click Sign Out.
- Wait 30 seconds, then click Sign In and re-enter your Apple ID credentials.
- Retry the download.
Step 3: Resolve Any Outstanding Apple Balance
If Apple tried to charge you for a subscription renewal and the payment failed, your account will be restricted from new purchases until the outstanding balance is cleared.
- Open Settings on an iPhone or iPad signed into the same Apple ID (it's often easier to manage billing here).
- Tap your name at the top > Subscriptions.
- Look for any subscriptions marked as Billing Issue in red.
- Tap the subscription and update the payment method, or cancel the subscription to clear the pending charge.
Alternatively, on Mac go to App Store > Account Settings > Purchase History to see if there are any failed transaction statuses.
Step 4: Check Your Apple ID Region
If you created your Apple ID in one country and are now using it in a different country, you may encounter errors when trying to access country-specific apps or content.
- Open the App Store and scroll to the bottom of any page. It will show your current storefront country (e.g., "United States").
- To change your App Store country: go to App Store > Account Settings > Country/Region and follow the prompts to change your billing country. You will need a valid payment method for the new country.
Conclusion
Error 1033 in the Mac App Store is an account verification failure, almost always related to payment information or authentication session issues. Updating your payment method and signing out and back into the App Store resolves the vast majority of Error 1033 occurrences quickly and without any technical expertise required.
