The TurboTax software license allows the purchaser of the software to download and install the software on up to 5 different computers owned by the purchaser.
The license is....you can install on 5 computers you own. Install it the same way as the first time.
How to install with a License Code
https://ttlc.intuit.com/community/tax-topics/help/activating-turbotax-cd-download-software/00/852971
Have you installed from the CD the first time? It may be a problem to use the CD a second time. It will be better to first install using the download option. Then you can download it again to another computer.
If you bought the CD you can install it on up to 5 computers that you own. If you install using the CD option on the first computer you must use the CD every time. If you use the Download option then you must use the download every time ... you cannot mix and match.