I was playing and then my screen went black, i restarted pc pressing power button, then game was uninstalled

Age of Empires III: DE Ask for Help
1

i want to know if i can just make something for steam finds my game, i dont find it, it says it should wiegh 80 gb but i only found a folder that weighs 2 gbs.

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2

place the game in the folder, steam will ssee there is a folder and check the game files.