Uncaught Error: Syntax error, unrecognized expression: [href=#] in ordpress

To temporarily solution
Until your theme developers release a fixed version,
you can add the following code snippet into your theme functions.php file

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add_action( 'wp_enqueue_scripts', 'load_old_jquery', 100 );
function load_old_jquery() {
if ( ! is_admin() ) {
wp_deregister_script( 'jquery' );
wp_register_script( 'jquery', ( "//ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js" ), false, '1.11.3' );
wp_enqueue_script( 'jquery' );
}
}

Add Overlay on Contact Form 7 Submit Button

=> Add below script in Wordpress Footer

<script type="text/javascript">
jQuery(document).ready(function (){
// Contact Form 7 Submit Button Overlay
var OriginalSubmitValue;
jQuery('.wpcf7-submit').on('click', function () {
OriginalSubmitValue = jQuery(this).val();
jQuery(this).val('Processing ...');
/*setTimeout(function(){jQuery('.wpcf7-submit').attr('disabled','disabled');},1000);*/
jQuery("body").after('<div id="quoteformloadingscreen" style="background: rgba(0, 0, 0, 0.4);position: fixed;top: 0;left: 0;z-index: 999999;width: 100%;height: 100%;overflow-y: hidden;overflow: hidden;"></div>');
});

// Hide new spinner on result
jQuery('div.wpcf7').on('wpcf7:invalid wpcf7:spam wpcf7:mailsent wpcf7:mailfailed', function () {
//jQuery('.ajax-loader-custom').css({ visibility: 'hidden' });
//jQuery('.wpcf7-submit').prop('disabled', false);
jQuery('.wpcf7-submit').val(OriginalSubmitValue);
jQuery("#quoteformloadingscreen").remove();
});
});
</script>