It should be sufficient to select "Project --> Build Project" in eclipse
Open a console and go to the main folder "silecs-eclipse-plugin"
run mvn install
Check if there are any errors (red markers) on the files/folders of the project ... if so, try to fix the problems or call the Silecs-Support
For eclipse-neon I got many erros in the Manifest like "Bundle 'org.eclipse.core.runtime' cannot be resolved". The solution was: I had to set the eclipse-target-platform in "Window-->Preferences-->Target Platform --> Add --> Default" and check the checkbox for it.