I guess everything is OK with this
nginx -t because in case of failure the installation script reverses everything back to normal.
I think the problem lays with the
mv command @nimch quoted earlier. If you are in a hurry and know how to do it, clone the repo, edit the
install script and replace lines 78 and 79
sudo mkdir $final_path
sudo mv $tmp/$app $final_path/..
sudo cp -Rfv $tmp/$app $final_path/
Then run the moulinette with this local package. I will anyway look into it tonight.