Broken plugin (can’t auto delete)

for anyone who want to try this plugin think twice! the uninstallation is broken,u can’t easily delete the plugin like normal,it will leave the usergroup in your your db that waste your time trying to delete it,the installation is easy with the good guide,but the uninstallation part is very bad,u can’t find any guide how to uninstall this plugin.need to do improvement on documentation.