Did you buy the download from Turbo Tax or somewhere else?

How to download Turbo Tax

https://ttlc.intuit.com/community/installing/help/how-do-i-download-the-software-i-purchased-at-turb...

Find the License Code if you downloaded from Turbo Tax or the Advantage plan

https://ttlc.intuit.com/community/tax-topics/help/i-can-t-find-my-license-code/01/855904

I purchased Turbo Tax on line Order # OSTCA142416348.  How do I download it so that I can use it.

Didn't the links above work for you?  Did you buy it directly from Turbo Tax or somewhere else?