Shadow of war installed, but steam doesn't detect it

Oct 25, 2018
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Hi guys, I have been downloading Shadow of War for a few days (bad shared wi-fi) and when I finally downloaded it, everything was fine, I played it for few hours but after one cutcene game lagged so I had to restart my laptop but when I opened steam again instead of Play button there was Install, but I have already installed it and all game files are in steam folder, I don't really wanna install it again, and also I don't have enough free space ( I have lots of games and movies on my laptop) is there any solution? I've tried to start game without steam or in offline mode, doesn't worked. Pls help.