Open a Groovy Console and type upgrade "latest".

Select the Rodin "Import…" menu command and import Lift.zip.
Right-click on the MLift model and select the "Start Animation" command:

Click on setup_constants and initialise in the Events view:

Go into the ProB Menu at the top and select ...

You can now see a graphical visualisation of the state of the model:

You can also click on the buttons in the HTML page to control the model.