Maybe add this info:

For the EKX to work correctly, move the "midi" folder to the EZkeys "Sound Library".
Overwrite, if neccessary.
Then rename the extracted folder that contains the other files and folders to "EZK2-DarkIndustrial" and move it into the "Sound Library", too.

macOS:
1) rename downloaded folder to: EZK2-DarkIndustrial
2) place folder in Library > Application Support > EZkeys
2) copy file named: 000732@EKX_DARK_INDUSTRIAL inside EZK2-DarkIndustrial > Midi folder and place in Library > Application Support > EZkeys > MIDI folder