Left click on the workspace background, and select Workspace
Copy/paste the installation code in the Shout Workspace window
Select the pasted text in the window, right-click and choose Do It
The framework will automagically load all the dependencies
Optional: Class Browser customisation.
Left click on the workspace background, and select Class Browser from the World menu.
click on the top-left icon to activate a menu
Select Choose new default Browser
Pick the O2PackageBrowserAdaptor one
Do not forget to Save the image before leaving Pharo.