As you are looking through the inspector fields on the Ultimate Character Controller objects you’ll see a field which looks similar to this field within . . .
The documentation for Jump says to add the ability and "No extra setup is required – when the Jump button is pressed the jump ability will start." You should add a note that says to turn off "Wait For Animation Event" if there is no model, otherwise it won't work. Better still, turn it off by default if you create a character with no model.