You can contact TurboTax. Since you already purchased the...

"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.

https://ttlc.intuit.com/replies/3300041

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

https://ttlc.intuit.com/replies/4201231

Trying to submit a return. Turbotax message says the submission is a duplicate. Then says they could not find a federal return that matches. Both submitted at SAME TIME.

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"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!"

"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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"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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"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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