Your problem with the scenery is you are not converting the images to BMP's. They come as JPG's but you have to convert them with a batch process to BMP, you can't just rename them. Read the readme file.

You also need to assign the folding wings on the Corsair to a keypad button. Again, it's in the readme file with a picture instruction.

These planes will tip stall. Also increase the simulation speed to 115%.