thp_upsell_popup_scripts_enqueue.php

<?php

function my_upsell_popup_scripts_enqueue () {
	
	if ( is_page( 13 ) ) { //CHANGE 13 TO THE ID OF YOUR PAGE!
		
		wp_enqueue_script( 'thp-flickity-js', get_site_url().'/wp-content/plugins/woocommerce-upsell-popup-pro/js/flickity.pkgd.min.js', array('jquery'), '', false );
		wp_enqueue_style( 'thp-flickity-style', get_site_url().'/wp-content/plugins/woocommerce-upsell-popup-pro/css/flickity.min.css' );
		wp_enqueue_style( 'thp-flickity-style-fix', get_site_url().'/wp-content/plugins/woocommerce-upsell-popup-pro/css/fix.min.css' );
		
		$ajax_enabled = get_option( 'woocommerce_enable_ajax_add_to_cart' );
		
		if ( 'yes' === $ajax_enabled ) {
			wp_enqueue_script( 'thp-wuppro-js', get_site_url().'/wp-content/plugins/woocommerce-upsell-popup-pro/js/wuppro-ajax.min.js', array('jquery','thp-flickity-js'), '', false );
			wp_localize_script( 'thp-wuppro-js', 'thp_wuppro_vars', array(
				'ajaxurl' => admin_url( 'admin-ajax.php' ),
				'added_to_cart' => __( 'Added to Cart!', 'woocommerce-upsell-popup-pro' ),
				'added_to_cart_mult' => __( 'Successfully added to cart!', 'woocommerce-upsell-popup-pro' ),
				'checkbox_warning' => __( 'Please select at least one item!', 'woocommerce-upsell-popup-pro' ),
				'single_dropdown_warning' => __( 'Please choose one option!', 'woocommerce-upsell-popup-pro' ),
				'mult_dropdown_warning' => __( 'You still have not chosen an option on at least one of your selected items!', 'woocommerce-upsell-popup-pro' )
				)
			);
		}
		elseif ( 'yes' != $ajax_enabled ) {
			wp_enqueue_script( 'thp-popup-mult-js', get_site_url().'/wp-content/plugins/woocommerce-upsell-popup-pro/js/wuppro-noajax.min.js', array('jquery','thp-flickity-js'), '', false );
			wp_localize_script( 'thp-popup-mult-js', 'thp_popup_mult_vars', array(
				'checkbox_warning' => __( 'Please select at least one item!', 'woocommerce-upsell-popup-pro' ),
				'single_dropdown_warning' => __( 'Please choose one option!', 'woocommerce-upsell-popup-pro' ),
				'mult_dropdown_warning' => __( 'You still have not chosen an option on at least one of your selected items!', 'woocommerce-upsell-popup-pro' )
				)
			);
		}
	}

}
add_action( 'wp_enqueue_scripts', 'my_upsell_popup_scripts_enqueue' );