If you originally installed from the CD it seems you can not download it from online now. You can't do both CD and download. See the info on this FAQ
https://ttlc.intuit.com/community/installing/help/i-bought-the-cd-but-my-computer-doesn-t-have-a-cd-...
So you need to call in to get the download pushed to your account.
Or try copying the CD to a usb flash drive, maybe you can use a friend's computer to copy it. See SteamTrains post here. But this might only work for Windows.
https://ttlc.intuit.com/community/taxes/discussion/why-can-t-i-install-turbotax-on-my-laptop-via-dow...
And user insub posted a solution using the usb to copy the CD
https://ttlc.intuit.com/community/taxes/discussion/this-license-code-has-already-been-associated-wit...
