I assume it’s the male genitals you are trying to use on Michael 5, despite the thread title? Some more information on how they are failing would be useful - are you having a texture mis-match? If so note that the male genitals, unlike the female, use their own maps so you will need to be using a texture set that includes those, and to be applying the correct materials to both base figure and genitals.
There is a problem in Carrara with the male genitals. If you load the figure by itself and apply a texture map, it looks fine. When it is conformed to the figure, there are white swirls and other messed up mapping. In Carrara, somehow the UV map shifts when the figure is geografted into place.
Another issue is (how do I put this delicately?): In studio, if you load the figures, the bend morphs are in place so that it hangs down. When you open it in Carrara, the bend morphs are not preloaded and the figure sorta sticks straight out.
One test I did was to fit and apply the figure and textures to M5 in studio. It looks like it is supposed to in studio.
Save the file.
Open it in Carrara.
The textures for the figure have the same white swirls and blotches as trying to load the files in Carrara.
To sum up, the textures load fine on the figure when it is not attached to M5, but they mess up when attached.