No, Robert v5 comes with the stock replacers bundled. You do not need to do a separate download. When you installed Robertv5, did you choose yes when you were prompted to overwrite anything? Also, the mod is installed properly if the textures are displaying when all other mods are disabled.
"I meant the Robert's body mod didn't install because of the textures which work when all mods are disabled." <-- Please, clarify. How did you verify that the v5 Male Body Replacer was not installed, and when you say "all mods are disabled" does that mean that you disabled Robert's plugin as well?
Taken from my edit-in a post above,
Just installed http://www.tesnexus.com/downloads/file.php?id=20328 and torsos are now visible, but my game lags badly. :banghead: :brokencomputer: headache incoming.
Robert's was not disabled during the texture test process
EDIT: The lag was just a one time thing, I restarted and it's gone now. Textures on the body are messed up(of course) once I reactivated the other mods.