Installing Aircraft

Right now don't have too much to smile about. Have a multi part question, which I hope the moderator will allow. When I download an aircraft to a temp folder & then want to move it to the aircraft folder in FS2002, I find it on C:\ hard drive. When I try & move it, receive message "can't move, source & destination folder are the same."Aircraft do not show up in FS2002 select aircraft. Probably by accident I have downloaded a half dozen aircraft. Trying to download a P-51 now which doesnt fit the usual pattern. In the sub folders it lists "POD" files. Instructs unzip the "DLL"into the modules\PC directory, unzip all other files into Fly\Aircraft directory. Its the ROTW "BlackCat" P-51D. Any help with this one will be greatly appreciated. Have read tutorial on installing aircraft, thanks.