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Answers
The RapidProM is a legacy extension provided by the Process Mining Group at the Technische Universiteit Eindhoven (TU/e). It has been built and tested for RapidMiner 5.3. Unfortunately, it seems it is no longer actively maintained, but the source code is available on their official page:
rapidprom:getting_started | ProM Tools
You can try to contact the authors there.