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The oldest supported Java RFA API is version 7.6.X which uses Java 1.7. There are no older versions available for download. There are older unsupported versions of RFA that did work with Java 1.6 but can't be accessed any longer.
Thanks for your prompt answer Nick !
RFA C++ API version 7.6.2 supported Windows platforms
From SFC (SSL?) to RFA - are connection parameters the same?
Can I use the TREP 3.0 service as a client program using RFA API 6.X?
LPC fail to start on a cloned linux machine
Data Feed update time is a little bit later