What are the differences between the Userbooster editions, in a few words?
Userbooster comes in three editions: Professional, Light and Freeware. All editions share the same core functionality but have different sets of features.
Userbooster Professional is an ultimate edition with the richest set of features and its keeps its data in a database.
Userbooster Light stores its settings in an XML file and has fewer features that Userbooster Professional.
You can learn more about the differences from this table.