download from https://www.pianobook.co.uk/library/ghost-piano/
enter your email and then right-click on 'ESX24'. then click "Copy Link address" and then enter it into the terminal:
# install python3, ffmpeg
sudo apt install python3 python3-pip ffmpeg
# install audiolazy
sudo -H python3 -m pip install audiolazy
wget <link address>
# change name and unzip
mv *index* dl.zip
unzip dl.zip
# remove unnessecary
rm -rf dl.zip __MACOSX
# convert to format
python3 convert.py
# if successful then
rm -rf 'Ghost Piano'