I want to install the desktop version on both a Mac and a PC. Can I do so with the same license?
Yes, you can install on a Windows PC and a Mac computer that you own.
Once you have the license code go to this website to download the software, choose Window or Mac - https://turbotax.intuit.com/personal-taxes/cd-download/install-turbotax/
Have you tried it? I tried to do it for the 2022 version and it wouldn't let me.
If you have the license code for the 2022 program, sign onto your download website - https://accounts.intuit.com/app/account-manager/productsBilling/turbotax?piuInFlyout=true&openBlueDot=true&accountSwitcherInFlyout=true&rgn=US&prgn=US&account-scheme=ind
On the 2022 program click on the link Licenses and downloads
On the next screen under Need a download or a download for a different operating system (Windows or Mac)? Click on the link enter your license code here