If you have bought TurboTax CD/Download, you will be asked for the licence code when you install the software. Please see this TurboTax FAQ for more information on the licence code: Where is my TurboTax licence code? You can download the current version of TurboTax CD/download edition here:  Choose the 2023 TurboTax edition you need (for Windows). You can download older versions of TurboTax CD/download edition here: Where can I download the CD/download edition of TurboTax?

Where do I put in the license code for activating my 2025 income tax return?

You spelt License wrong

@Gerry14 Are you using a TurboTax Desktop version or a TurboTax Online version?