TurboTax Online does not use license codes so you will not be able to apply your CD\download license to use TurboTax Online.
You can request a refund for CD\Download. Click How do I request a refund for my TurboTax product?
You can also contact support. They may be able to install your product.
You can start for free with TurboTax Online and pay when you are ready to file.
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