"I PURCHASED TURBO TAX DELUXE FROM COSTCO, TRIED TO INSTALL, BUT CAN'T UPGRADE MY MAC OPERATING SYSTEM SO I CAN USE IT. MESSAGE SAYS TO USE TURBO TAX ONLINE. HELP!"

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You can contact TurboTax. Since you already purchased the desktop product, we can give you a code to eliminate the online charges.

Once you receive the service code use the FAQ below to enter it:

Do you have an Intuit account?