If you do not have the Mod Loader installed, you can download it from here.
One click install doesn't work if you've installed the Mod Loader without administrator permissions.
You can fix one click install by launching the Mod Loader as an administrator and hitting the "Reapply" button in the settings.
I suppose you could use it in the jungle too!
Forgot to include the info.json. You should now see the skin in the modloader.
{'version': {'orig': '1.0.0', 'new': '1.0.1'}}