Too expensive and free version make problems

I installed the plugin, and I even could set up the website in another language after make the translation, its ask for a paid version. The free version its also not seo friendly and the worst: after uninstall the software many files from the plugin stay in my website, so if you type my url plus /en going, it’s going to show a page from GTraslate doing advertising… This software should be banned from WordPress just because of this.