How to find my Dead Space 2 key?

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I'm temporarily uninstalling Dead Space 2, which I installed a looong time ago. The uninstaller said that I should de-authorize the game to be given one of my 5 activations back. The tool to do so requires my serial number, but I can't for the life of me find it anywhere.
Where might it be available? I did not buy the game through Steam, but it was a digital download of sorts.
Given that the game is already installed and authorized, can I extract the key from the installation somehow?
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How do you activate Dead Space 2?
You need to go to Control Panel ---> Nvidia Control Panel ---> Manage 3D settings ---> Global Settings ---> Preferred graphics processor ---> High-performance NVIDIA processor. Voila! Now launch Dead Space 2 and it will ask for the activation key.. Just enter the correct key and it will ask you no more.How do you activate Dead Space?
Here are five ways to activate 'dead space' in mixed-use developmentsDoes Dead Space 2 require EA account?
Buy Dead Space 2 \u2013 PC \u2013 EA. INTERNET CONNECTION, ONLINE AUTHENTICATION AND ACCEPTANCE OF END USER LICENSE AGREEMENT REQUIRED TO PLAY. ACCESS TO ONLINE SERVICES AND OR FEATURES REQUIRES AN EA ACCOUNT AND GAME REGISTRATION WITH THE ENCLOSED ONE-TIME USE SERIAL CODE.How much did Dead Space 2 Sell?
Former Visceral level designer Zach Wilson took to Twitter and revealed that Dead Space 2 cost about $60 million to produce. Despite the costs, the game only sold around 4 million copies.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: cottonbro, Los Muertos Crew, Andrea Piacquadio, cottonbro