Once you have accessed your customer portal and have your Tableau Desktop license key, follow these steps to activate each copy of Tableau desktop.
STEP 1: Open Tableau Desktop, access the HELP menu, and choose ‘Manage Product Keys’.
STEP 2: Click ‘Activate’ and enter your product key. Click ‘Activate’ on the new window.
STEP 3: Complete. Your license is now activated and your maintenance renewal date will be displayed.