This plugin supports versions from 1.7 - 1.16 (hopefully). If you notice that a certain version does not work, please contact me.
The whole point of the plugin is to make the ability to change skins effortlessly. With just a few seconds it takes to set up the plugin, you get a reliable plugin you can use at any time.
No, refunds are not possible, but I can assure you won't be disappointed with the plugin.