I also read Nintendo website about GameCube controller. I also tried plugging a Wii Classic Controller into Wii Remote and pressing the Start key of Wii Classic Controller, still nothing happened. There is no Start key on Wii Remote or Nunchuk. Actually as soon as the installer starts, the LED light goes off, meaning that the Wii Remote is disconnected if I understand correctly. With the 1 key of my Wii Remote pressed, nothing happens.
When IOS236 installation starts, it displays some message and says 'Press 1 or Start to start the application'. This might be a super stupid question but I've done a lot of search on the internet and found nothing.