I gifted away my FunCubePro+ to a young member of my radio club so I can't follow up with specific details.
I do have an RSP2 and SDRuno to work with so not completely in the dark.
Manual talks about ExtIO panel popup for times when SDRuno is started and no device found. Under conditions when my RSP2 is not connected program tries to start and then closes. Looking in my startup folder which is not my 'document' folder I see my ExtIO might be out of date. That could explain the abrupt shutdown.
My expectation from reading the manual and there are no specific details that I have found yet, is that if funcube is supported it will be listed in the ExtIO popup panel as a selection.
SDR# does list funcube DLL in the executable folder resulting in a selection once SDR# is running. It does not look to me that SDRuno follows that model if that is your expectation.
Need to run errands so I will look into updating my ExtIO and see if I get the ExtIO popup and report back.
Mike