You don't have to copy anything manually anywhere. Just do this:I believe those are folders that don't exist by default. Would that go in:
1. Custom > Atom > Person > Textures > (Doesn't Exist) Stopper > Alt Futa
2. Custom > Atom > Person > Plugins > (Doesn't Exist) Stopper > Alt Futa
3. Custom > Plugindata > (Doesn't Exist) Stopper > Alt Futa
4. Custom > Scripts > Stopper > Alternativefuta > (Doesn't Exist) Textures
5. or?
1. Go to Stopper Alt Futa Plugin, select "Penis Material Options", then "Textures"
2. In the _BumpMap and the _DecalTex slot add one decal and normal map (e.g. from my package)
3. Be aware that you also have to select corresponding skin textures for a perfect alt futa skin. See https://hub.virtamate.com/resources/altfuta-plugin-female-futa-switch-demo.52707/.