I cannot see my plane

Greetings,
I'm new to downloading freeware and up to this point I've been doing ok at it by following the 
instructions as well as I can, but I downloaded "Project Opensky 757 and I thought the install
went well when I started the sim (prepar3d v4.5) the plane was listed in the vehicle section I clicked on it
and went to the start menu and were the image of the selected plane appears it was black and it said,
"No Image Available".The plane is not there.Could someone please tell me what I did and how I can fix
it. thank you