There is no license code needed for a 2018 tax return.
Find download using Windows - https://ttlc.intuit.com/community/installing/help/find-your-turbotax-for-windows-software-download/0...
Install TurboTax for Windows - https://ttlc.intuit.com/community/refund-status/help/how-do-i-install-the-turbotax-software-for-wind...
Find download using Mac - https://ttlc.intuit.com/community/installing/help/find-your-turbotax-for-mac-software-download/01/25...
Install TurboTax for Mac - https://ttlc.intuit.com/community/installing/help/how-do-i-install-the-turbotax-software-for-mac/01/...
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Troubleshoot install for Mac - https://ttlc.intuit.com/community/installing/help/turbotax-for-the-mac-installation-troubleshooter/0...
