I did what you said but I´m afraid to say that it dosen´t work. I talked to my sister and she told me that she has the files in her download folder and it work´s. But it is strange that it is just the female adults and young adult female that it do not work on.
If you tried them in the default folder they should work....
If you kept them in your downloadfolder it is still possible that you have other default replacements installed that the game will read first....
There is a whole list with default replacements that you simply can not use with these meshes, most are listed in the thread.
And put your sim detail to high in your game settings!
Try to redownload the package for the adults and put it in your Defaults folder.
Defaults written exactly the same way<----------