If you bought it from TurboTax, contact them directly.
If you bought it from a third party and have a license number, it is easy.
Go to your TurboTax account with intuit and click that you want to download TurboTax with a license number. https://shopping.turbotax.intuit.com/unified/downloads/myaccounts?route=MYACCOUNTS&cgcview=downloads
Then put in the license number and choose Mac (you have the option to choose Mac or PC)
