With your desktop program open, go up to the top left corner of your Mac screen. Next to the little apple---click on File and then choose "Check for Updates" from the drop down menu.
Or on a Mac, simply quit and reopen TurboTax. If there are any updates, you'll be prompted to download them.
If you are having problems updating Mac
https://ttlc.intuit.com/turbotax-support/en-us/help-article/update-products/turbotax-mac-keep-saying...
