You can install eTrice on top of e.g. the Eclipse Modeling Tools package (Indigo 3.7.2, Windows 32bit) from
eTrice can be installed from one of the eTrice update sites listed on the eTrice Downloads page.
Before you install eTrice you have to add the composite Xtext releases update site
and the Graphiti 0.8.2 release
to your list of available sites.