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Answers
RM 5.3 is not supported anymore. We highly recommend to use 9.X. They are all 64bit.
Best,
Martin
Dortmund, Germany
RapidMiner is written in Java. 64 or 32 bit is a property of the Java runtime you're using. You can use any RapidMiner version with either a 32 or a 64 bit Java runtime.
The "64 bit" refers to the included Java runtime. Just install a 64 bit Java and execute your old unsupported RapidMiner with it if you must. But you will really miss many great features.
Regards,
Balázs
David