B17 Missions Update Download

I have the B17 (Molly II) from AvHistory in the CFS3 aircraft /folder.
My problem starts when I select one of the missions in the Missions folder.
It or the program doesnot recognize the Molly II.
Did I miss any stesp in loading the B17 Missions Update?
My problem starts when I select one of the missions in the Missions folder.
It or the program doesnot recognize the Molly II.
Did I miss any stesp in loading the B17 Missions Update?