Your email states that TurboTax will no longer support Monterey 12. That's my OS. I have MacBook air 11 inch Early 2015. What is the update for me? Ones stated N/A.

See this TurboTax website for supported Operating Systems when using the 2023 TurboTax software on a personal computer (desktop or laptop) - https://turbotax.intuit.com/personal-taxes/cd-download/tta-system-requirements/

2024 Turbo Tax Desktop System Requirements is Windows 10 or later or Mac OS Ventura 13 or later. And for 2024 you can only buy the Download, they won't be selling the CD.
https://turbotax.intuit.com/personal-taxes/cd-download/tta-system-requirements

If you switch to the Online version you can transfer your 2023 return done in the Desktop program to the Online version. Post back next year if you need help transferring.

If you used the Desktop program before you may notice several differences and not like the online version. It has less features and no Forms Mode. You can only do 1 return. Your return is only saved online so be sure to save both the .tax2023 data file and the pdf file to your computer when you are done. In case you need to amend in the future or if you need a copy to get a loan or something. You might not be able to access your online return when you need a copy.