After downloading icCube I get the following message: “icCube” is damaged and can’t be opened. You should move it to the Trash
OSX doesn't allow to run downloaded application by default, you've to
a) Allow just icCube application, open the application with Ctrl+Click and select open in the menu (doc). The app will be saved as an exception in your security settings.
or a bit more brutal
b) Change your global settings in Security & Privacy to 'Anywhere' doc (bottom)
If you have MacOS High Sierra, the Security & Privacy window won't show the same default settings. In order to activate the "Allow apps downloaded from: Anywhere", just write on your Terminal:
sudo spctl --master-disable
and the option will be available again.