I had issues with Netflix after downgrade, but I uninstalled the add-on and dependencies again and got it working.
I’ve made a little script of the instructions on post 4, after installing v.18 do this in ssh session.
wget https://raw.githubusercontent.com/zjoasan/netflix-install-script/master/netflix_prep_install.sh
chmod +x netflix_prep_install.sh
./netflix_prep_install.sh