as everybody knows the CAD Moude Wireless (mini) is only supportet via bluetooth.
I found a way to get klicking set up with the universal receiver.
I installed the free Karabiner Elements https://karabiner-elements.pqrs.org/ to remap some keys.
Under "Devices" the 3D Connection Universal Receiver showed up, enabling the "modify events" switch makes the mouse button klicks work.
Have fun