You have to talk to customer support.
To call TurboTax customer support
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
Customer support is available from 5 a.m. to 5 p.m. Pacific time Monday-Friday
Which link or post didn’t work anymore?
Nov 2024, They changed the FAQ that said how to switch between Windows and Mac. This post is for last year, see if it still works, user caw4 on 2/26/23 found a way to get both the Windows and Mac downloads. Has screenshots.
Did you install the Desktop program yet at all like on Windows? Did you set up or log into an Intuit Account? Or did you buy the wrong download in the first place? Did you get the License Code? Where to find the License Code
https://ttlc.intuit.com/community/tax-topics/help/i-can-t-find-my-license-code/01/852973
When I log into my Account and go to Products & Billing all your years are listed. If you click on Licenses and Downloads on 2023, at the top is…..
Need a download or a download for a different operating system (Windows or Mac)? Where you can enter your license code. I suspect it will be the same for 2024. See my screen shot