How to download my custom theme?

You can download installed themes and plugins from the WordPress dashboard with a plugin like this: https://wordpress.org/plugins/wp-theme-plugin-download/

jQuery is not defined – some theme features do not work!

I had a similar problem after updating WordPress, try adding this in functions.php : function load_jquery() { wp_register_script(‘mainJquery’, get_template_directory_uri() . ‘/assets/js/jQuery.js’, array(‘jquery’), 1, true); wp_enqueue_script(‘mainJquery’); } add_action(‘wp_enqueue_scripts’, ‘load_jquery’); I was only missing array(‘jquery’), maybe it’s the same for you…