Cloning the repo:
git clone https://github.com/Howchoo/pi-power-button.git

Running the following gets an error saying that the file or folder does not exist:
./pi-power-button/script/install

(unfortunately the text is in swedish, so ive translated it in the title of the issue)
looking in the folder with "ls" i can see the install file:

And this is on Raspberry Pi OS Lite (32-bit) running on a Raspberry Pi 4 Model B.