This issue/behavior may manifest under certain configurations, and is triggered by the MacOS GateKeeper functionality: It is linked to the download location of the installer, which is not marked as "safe" by Apple. Apple removed the "Anywhere" location installation option out of the "Security and Privacy Settings" with their latest macOSs.
Please see the article below:
http://osxdaily.com/2016/09/27/allow-apps-from-anywhere-macos-gatekeeper/
To overcome this issue follow the steps below:
Close Apple "Security and Privacy Settings" dialog
Open a Terminal Window under Applications-->Utilities
Paste "sudo spctl --master-disable" to the Terminal and enter you password
Start the ARES Commander Application.
Paste "sudo spctl --master-enable" to the Terminal (Resets the installation rights that you Mac is save again)
Type "Exit" and close the Terminal Window again.