This plug-in is part of other FeatureIDE plug-in, The approach is already implemented in FeatureIDE.
 So, if you already installed it or plan to use it, no need to download this plug-in.
 To prioritize configurations based on similarity, click on the right button on the FeatureIDE project from " project explorer".
 Then, click on "FeatureIDE" then "product generator", a dialogue called "Build products" will be opened. 
Then, you can select how to order products. For our approach, we called it "difference".  
For more details about FeatureIDE, go to: 
http://wwwiti.cs.uni-magdeburg.de/iti_db/research/featureide/