FSToolkit has been tested with the latest Eclipse Helios version . You need the Eclipse Modeling Tools edition so please go to ​http://www.eclipse.org/ and download it.

Lunch Eclipse and go to Help-> Install Modeling components. Make sure to check XPand, XText (and any others you wish). After installation restart Eclipse.

Install the FSToolkit plugins by going to Eclipse Help-> Install New Software… and then put the location: http://nam.ece.upatras.gr/fstoolkit/downloads/gr.upatras.ece.nam.fstoolkit.updatesite/