It depends on what kind of code you have.
If you have a License Code, this is for Desktop software; and if you have an Activation Code, this is for Online software.
These are different software's and codes from one cannot be used in the other one.
For TurboTax Online, you can activate your code to your account on this link.
For TurboTax Desktop, you can download/install your software from this link.
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