TurboTax software can be installed, authenticated, and activated on up to 5 different computers you OWN per the TurboTax Desktop Software End User License Agreement for Tax Year 2021 You cannot share the software with others.

You can download your software to the other computer, click to install, then enter your License number.

How do I move my tax data file to another computer?

https://ttlc.intuit.com/community/tax-data-file/help/how-do-i-move-my-tax-data-file-to-another-computer/00/26128

@mdelaney58 

You are posting from the ONLINE version  ... the liscense code can only be used on the DOWNLOADED version.

Did you install from the CD on one computer and now need to downloaded it on another ?   If so you will need to call TT support : 

Please contact support via phone for assistance with this situation … contact details can be found here