If you purchased the software from TurboTax then contact TurboTax support and they can push a Mac installation file to your download account at no charge.
Support is open from 5am to 9pm Pacific time
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax