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Please explain a little more, what you are working with, and what you hope to find... 'KeyJack driver' does not suggest anything to me, by itself, I'm sorry to have to say.
Thanks for the explanation of the situation.
I presume - correct me if I'm wrong - that there is no driver for El Capitan available for the Ergodex interface device at polymicrosystems.com ?
So the situation is that it does not work with an El Capitan machine and you need a driver to make the device even basically work in such a context - is that correct ?