Editor software won't open. MAC

Hi, guys! I just bought the AKAI MPK mini MkII, cool little keyboard. I have a problem with opening the Editor software, I'm using a mac with a 2.9 GHZ intel core i7, and 8 GB memory. When I dubbel click the .dmg file it appears as it's going to open, but after that nothing happens. I really need this software to setup my pads to work with the drum machine at Logic Pro X.

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