Sorry for the late reply mate. Given you've actually read the description, go into steam and go into MSC's properties. Once you're in there go into local files and click on browse local files. In there should be a folder called unityassetfiles or something along these lines as well as an exe. Go into the subfolder 'unityassetfiles/sharedassets3/textures'. Once you've copied the textures you want to add go back into MSC's folder and run the texture importer executable.
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