WordPress 5.6 breaks plugin

I’m having the same issue ??

I’ve contacted the developers many times and they won’t respond. The plugin is still broken and they have not made any updates

You could update options.js with this code to fix the plugin:

jQuery(document).ready(function ($) {
    $(this).on('change', '.custom_field, .custom_textarea, input.qty', function () {
        $(this).trigger('show_options_final_total');
    });

        $(this).trigger('show_options_final_total');

    jQuery(document).on('found_variation', 'form.cart', function (event, variation) {
        var $variation_form = $(this);

        var $totals = $variation_form.find('#product-options-var-total');

        if ($(variation.price_html).find('.amount:last').size()) {
            product_price = $(variation.price_html).find('.amount:last').text();
            product_price = product_price.replace(woocommerce_custom_var_options_params.thousand_separator, '');
            product_price = product_price.replace(woocommerce_custom_var_options_params.decimal_separator, '.');
            product_price = product_price.replace(/[^0-9\.]/g, '');
            product_price = parseFloat(product_price);

            $totals.data('product-price', product_price);
        }

        $variation_form.trigger('show_options_final_total');
    });

    $(this).on('show_options_final_total', function () {

        var option_total = 0;

        var product_price = $(this).find('#product-options-var-total').data('product-price');

        if (typeof product_price == 'undefined') {
            var product_price = $('#product-options-var-total').attr('product-price');
        }

        product_price = parseFloat(product_price);

        var product_total_price = 0;

        var final_total = 0;

        $('.custom-variation').each(function () {

            var option_price = 0;

            option_price = $(this).attr('data-price');
            var value_entered = $(this).val();

            if (value_entered != '' || option_price == 0) {
                option_total = parseFloat(option_total) + parseFloat(option_price);
            }

        });

        var qty = $('.qty').val();

        if (option_total > 0 && qty > 0) {

            option_total = option_total * qty;

            option_total = option_total.toFixed(2);

            option_total = parseFloat(option_total);

            //console.log( product_price );

            if (product_price) {

                product_total_price = product_price * qty;

                product_total_price = product_total_price.toFixed(2);

                product_total_price = parseFloat(product_total_price);

            }

            final_total = option_total + product_total_price;

            final_total = final_total.toFixed(2);

            html = '';

            if (woocommerce_custom_var_options_params.show_op == 1) {
                html = html + '<dl class="product-options-price"><dt> ' + woocommerce_custom_var_options_params.op_show + ' </dt><dd><strong><span class="amount">' + woocommerce_custom_var_options_params.currency_symbol + option_total + '</span></strong></dd>';
            }

            if (final_total) {

                if (woocommerce_custom_var_options_params.show_ft == 1) {
                    html = html + '<dt>' + woocommerce_custom_var_options_params.ft_show + '</dt><dd><strong><span class="amount">' + woocommerce_custom_var_options_params.currency_symbol + final_total + '</span></strong></dd>';
                }

            }

            html = html + '</dl>';

            $('#product-options-var-total').html(html);

        } else {

            $('#product-options-var-total').html('');
        }

    });

    $(this).find('.variations select').change();

	var variation_id = '';
	jQuery(document).on('found_variation', 'form.cart', function (event, variation) {
		main_col();
	});
	jQuery('.variations select').on('ready change', function () {
		jQuery(document).on('found_variation', 'form.cart', function (event, variation) {
			main_col();
		});
		jQuery("body").on('click', '.reset_variations', function () {
			main_col();
		});
	});

    function main_col() {

        $('#product-options-var-total').html('');
        variation_id = jQuery(".variation_id").val();

        // alert(variation_id);

        if (variation_id !== '' && variation_id !== undefined && variation_id !== 0) {
            jQuery('.phoen_minss').each(function () {
                jQuery(this).find('input').val('');
                jQuery(this).find('textarea').val('');

                if (jQuery(this).hasClass('phoenwwe_' + variation_id)) {
                    jQuery(this).css('display', 'block');
                } else {
                    jQuery(this).css('display', 'none');
                }
            });
        } else {
            jQuery('.phoen_minss').each(function () {
                jQuery(this).find('input').val('');
                jQuery(this).find('textarea').val('');

                jQuery(this).css('display', 'none');

            });
        }
    }

});

Thank you veeeery much @ideatic, your code brought this plugin back to life… Until next time ??