"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!"

[DenaeLO]

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