Only the TurboTax CD would have both the Windows and Mac installation files.
If you are going to download the 2019 software then choose which one you want to download first. Then when TurboTax support is open you can request to have the software for the other OS pushed to your download account. That should be at no charge to you if you have already paid for one download.
Go to this TurboTax website for the desktop CD/Download editions - https://turbotax.intuit.com/personal-taxes/cd-download/
TurboTax support is open from 5am to 5pm Pacific time, Monday thru Friday
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
