On OSX you need to approve some permissions.
These will be asked when you run the installer
The accessibility settings under newer versions of MacOS are now to find under "Privacy and Security"
The license of the listener had been changed, because of this you might need to re-apply some settings
There can be issues when there is a previous version installed. In the System Preferences uncheck the VICREO-Listener. After that, you would need to restart open System Preferences and check the VICREO-Listener again under accessibility.