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<?php
/**
 * Variable product add to cart
 *
 * @author        WooThemes
 * @package       WooCommerce/Templates
 * @version       2.3.0
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
} // Exit if accessed directly
global $product, $post;

// resize the main image of each variations
if ( function_exists( 'yith_wcmg_is_enabled' ) && yith_wcmg_is_enabled() && !is_quick_view() ) {
    foreach ( $available_variations as $variation_id => $variation ) {
        $available_variations[$variation_id]['image_src']       = yit_image( "src=$variation[image_src]&size=shop_single&output=url", false );
        $available_variations[$variation_id]['image_magnifier'] = yit_image( "src=$variation[image_magnifier]&size=shop_magnifier&output=url", false );
    }
}

/* woocommerce subscription price fix */
$class_subscription = "";
if ( $product->product_type == 'variable-subscription' ) {
    $class_subscription = "subscription";
    $woo_option         = get_option( 'woocommerce_subscriptions_add_to_cart_button_text' );
    $label              = $woo_option ? $woo_option : apply_filters( 'subscription_add_to_cart_text', __( 'Sign Up Now', 'yit' ) );
}
else {
    $label = apply_filters( 'single_add_to_cart_text',yit_icl_translate( "theme", "yit", "add_to_cart_text", yit_get_option( 'add-to-cart-text' ) ) , $product->product_type );
}

?>

<?php do_action( 'woocommerce_before_add_to_cart_form' ); ?>

<form action="<?php echo esc_url( $product->add_to_cart_url() ); ?>" class="variations_form cart group" method="post" enctype='multipart/form-data' data-product_id="<?php echo $post->ID; ?>" data-product_variations="<?php echo esc_attr( json_encode( $available_variations ) ) ?>">

    <?php if ( ! empty( $available_variations ) ) : ?>

    <?php if ( is_shop_enabled() && yit_get_option( 'shop-detail-add-to-cart' ) && yit_product_form_position_is( 'in-sidebar' ) ) : ?>
        <div class="quantity-wrap group">
            <label><?php _e( 'Quantity', 'yit' ) ?></label>
            <?php woocommerce_quantity_input(); ?>
        </div>
    <?php endif; ?>

    <div class="variations">
        <?php $loop = 0; foreach ( $attributes as $name => $options ) : $loop ++; ?>
            <label for="<?php echo sanitize_title( $name ); ?>"><?php echo wc_attribute_label( $name ); ?></label>
            <div class="select-wrapper">
                <select id="<?php echo esc_attr( sanitize_title( $name ) ); ?>" name="attribute_<?php echo sanitize_title( $name ); ?>" data-attribute_name="attribute_<?php echo sanitize_title( $name ); ?>">
                    <option value=""><?php echo __( 'Choose an option', 'yit' ) ?>&hellip;</option>
                    <?php
                    if ( is_array( $options ) ) {

                        if ( isset( $_REQUEST[ 'attribute_' . sanitize_title( $name ) ] ) ) {
                            $selected_value = $_REQUEST[ 'attribute_' . sanitize_title( $name ) ];
                        } elseif ( isset( $selected_attributes[ sanitize_title( $name ) ] ) ) {
                            $selected_value = $selected_attributes[ sanitize_title( $name ) ];
                        } else {
                            $selected_value = '';
                        }

                        // Get terms if this is a taxonomy - ordered
                        if ( taxonomy_exists( $name ) ) {

                            $terms = wc_get_product_terms( $post->ID, $name, array( 'fields' => 'all' ) );

                            foreach ( $terms as $term ) {
                                if ( ! in_array( $term->slug, $options ) ) {
                                    continue;
                                }
                                echo '<option value="' . esc_attr( $term->slug ) . '" ' . selected( sanitize_title( $selected_value ), sanitize_title( $term->slug ), false ) . '>' . apply_filters( 'woocommerce_variation_option_name', $term->name ) . '</option>';
                            }

                        } else {

                            foreach ( $options as $option ) {
                                echo '<option value="' . esc_attr( sanitize_title( $option ) ) . '" ' . selected( sanitize_title( $selected_value ), sanitize_title( $option ), false ) . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $option ) ) . '</option>';
                            }

                        }
                    }
                    ?>
                </select>
            </div>
        <?php endforeach;?><?php
        if ( yit_product_form_position_is( 'in-sidebar' ) && sizeof( $attributes ) == $loop ) {
            echo '<a class="reset_variations" href="#reset">' . __( 'Clear selection', 'yit' ) . '</a>';
        }

        ?>
    </div>

    <?php do_action( 'woocommerce_before_add_to_cart_button' ); ?>

    <div class="single_variation_wrap" style="display:none;">
        <?php do_action( 'woocommerce_before_single_variation' ); ?>

        <div class="single_variation <?php echo $class_subscription ?>"></div>

        <?php if ( $class_subscription != "" ): ?>
            <div class="clear"></div>
        <?php endif; ?>

        <div class="variations_button <?php echo $class_subscription ?>">
            <?php if ( yit_product_form_position_is( 'in-content' ) ) :
                echo '<a class="reset_variations" href="#reset">' . __( 'Clear selection', 'yit' ) . '</a>';
                ?>
                <div class="quantity-wrap group">
                    <label><?php _e( 'Quantity', 'yit' ) ?></label>
                    <?php woocommerce_quantity_input(); ?>

                </div>
            <?php endif; ?>
            <button type="submit" class="single_add_to_cart_button button alt"><?php echo $label ?></button>
        </div>
        <input type="hidden" name="add-to-cart" value="<?php echo $product->id; ?>" />
        <input type="hidden" name="product_id" value="<?php echo esc_attr( $post->ID ); ?>" />
        <input type="hidden" name="variation_id" value="" />

        <?php do_action( 'woocommerce_after_single_variation' ); ?>
    </div>

    <?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>

    <?php else : ?>

            <p class="stock out-of-stock"><?php _e( 'This product is currently out of stock and unavailable.', 'yit' ); ?></p>

    <?php endif; ?>

</form>

<div class="clear"></div>

<?php do_action( 'woocommerce_after_add_to_cart_form' ); ?>

This is the code for variable.php

There are no variations when I look in the source. Ensure they have prices and are not out of stock.

The above code also needs removing or updating to our 2.4 version.

everything works fine before update to 2.4.4

Because the template is made for 2.3. As I said, there is a new template file for 2.4 – the theme needs an update.