After a pause I connected my Due to the computer and tried some programming. But I can't even verify Blink. I have installed Due to the 1.8.2 IDE with the Boards Manager. And restarted the IDE.
Arduino: 1.8.2 (Windows 7), Board: "Arduino Due (Native USB Port)" Board arduino_due_x (platform sam, package arduino) is unknown Error compiling for board Arduino Due (Native USB Port).
Something simple probably, but not when you don't know it.