Where do I put in the license code, I already paid for the software.

You can go HERE to download the TurboTax Desktop Software.  When you select the product, it will give you the option of Windows or MacOs for the operating system.  During installation, you will be asked to enter your License Code that you purchased.

Please see these TurboTax Help Articles for more information:

• How do I get started with TurboTax Desktop
• How do I find my license code?
• Troubleshooting TurboTax Desktop for Mac Issues

Did you buy the Desktop program but accidentally get into the Online version? You need to download and install the Desktop program. Do you need help installing the Desktop program? How to get started with the Desktop program, install and activate it
https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-delivery/download-software-turbotax-com/L7u9oLEkq_US_en_US?uid=luqgvzrd

If you started in the Online version you can switch to the Desktop program and continue without paying for Online. How to switch…….
https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-switch-from-turbotax-online-to-the-turbotax-software/00/26129