couplers not there.

PLease Help, i just downloaded some FMC rolling stock repaints and form some reason no of them have the couplers on them? I am very new to this and would love form someone to please help me on this issue. Thank you.
https://railworksamerica.com/forum/
https://railworksamerica.com/forum/viewtopic.php?f=29&t=20012