Sorry your Mac is too old.
Mac System Requirements
https://ttlc.intuit.com/questions/1899173-minimum-system-requirements-for-turbotax-mac-software You will have to get a refund for the Desktop program. Then you can use the Online web version. Or try to upgrade your Mac or find another computer to install it on. The CD has both Windows and Mac programs on it.
Contact Customer Service 5am-9pm Pacific time 7 days a week,
https://support.turbotax.intuit.com/contact/
