ANSWER:
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How to uninstall and reinstall games on Steam using a PC or Mac computer. Published by Anson Alexander.
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1- When you first launch the game, Steam will automatically display any key needed for further activation.
Please note that this happens mostly for older games.2- In your Steam Library, click on the game in the list of games, then, click on the cogwheel icon on the right, followed by Manage and then on CD Keys.
Some games do not require key activation, in this case, you will not see the CD key option. Also, please note that the CD key option will only appear if the game is already installed or if the installation is started.