The problem doesn't have anything to do with how the mod works on MacOS, but with how the installation works, and the fact that OSX doesn't merge folders. By following the instructions for installing the low-res textures, Mac users are actually removing around 3/4 of the files in the Parts folder, instead of just replacing the model files for each part. In order to get the low-res textures properly installed, a Mac user would have to manually go replace each model, which is certainly doable, but also a pain. Hopefully there'll be some way around this.
