sudo apt-get install pigpio python-pigpio python3-pigpio
git clone https://github.com/geekworm-com/x735-v2.5
Now that you have those files get into that directory, make the script executable, and run it. This creates a /usr/local/bin/x735softsd.sh script for the button press:
cd x735-v2.5
sudo chmod +x *.sh