Or do you want to use online for 2024? Online might be saying if you transfer 2023 from your computer it will clear out your existing 2024 entries and start you over. Or if it doesn't let you clear to transfer because you registered and you have not paid for online you could just start a new online account and return and transfer into that. Then ignore your old online account.
If you want to use the Desktop program and you have paid the Online fees you can ask customer service to switch you and put the 2024 Desktop Download in your account. Otherwise you need to buy the Desktop program here,
https://turbotax.intuit.com/personal-taxes/cd-download
