Same installation instructions still apply. Just add the PPA (12.04 and 12.10) and install using these simple commands:
sudo add-apt-repository ppa:menulibre-dev/devel
sudo apt-get update
sudo apt-get install menulibre
Now, I’ve just got to find everyone that’s been looking for the Quantal version. If you know anyone that’s been looking for it, give them the good news! And should you stumble across any bugs, report them here. Thanks!