I do not wan to start for free I just want to buy a license key.
You can buy the Desktop Download program at
TurboTax® Desktop 2023-2024 | Tax Software Download
Or at several stores like Costco, Sam’s, etc. Where can I buy Turbo Tax Desktop program?
https://ttlc.intuit.com/community/choosing-a-product/help/where-can-i-buy-the-turbotax-software/00/25893
Then How to install and Activate the Desktop Download program with a License Code
How to install TurboTax CD/Download software with license code