Make sure you are using the latest version of WordPress (Dashboard > Updates). Our themes rely on newer WordPress functions and if they are not available, your website may not work. It is always recommended to run the latest version of WordPress. If you need to manually uninstall the theme, you can access your site files via FTP to delete the theme’s folder in /wp-content/themes/theme-name (or ask your host). WordPress will then switch to the default theme.