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The moment you install Tableau 10.0 either way , the activation key will automatically be picked up by the new upgraded version. As an additional precautionary step what you can do is , take a note of your Activation key ,if in case required. However the moment you upgrade or install the new Tableau 10.0 and go and check you will see the earlier Activation key is already there.
2 of 2 people found this helpful
To clarify this comment, before upgrading it is best practice to refresh the license key to synchronize with the most up to date purchased maintenance. If the license key has an expired maintenance date, the upgrade may fail. After ensuring the license key has been refreshed, the upgrade installation will automatically detect the existing license key.