unable to install – bug all site

Hello,

It looks like you are using an ancient version of PHP which doesn’t support closures. Kindly edit includes/functions.php and replace

add_action( 'comment_duplicate_trigger', function ( $commentdata ) {
	$post_reviews = mts_get_post_reviews( $commentdata['comment_post_ID'] );
	$output['status'] = 'fail';
	$output['error'] = 'duplicate';
	$output['rating_total'] = $post_reviews['rating'];
	$output['rating_count'] = $post_reviews['count'];
	$output['html'] = wp_review_rating( $post_reviews['rating'], $commentdata['comment_post_ID'], array( 'user_rating' => true ) );
	echo wp_json_encode( $output );
	exit;
} );

with

function wp_review_comment_duplicate_trigger( $commentdata ) {
    $post_reviews = mts_get_post_reviews( $commentdata['comment_post_ID'] );
    $output['status'] = 'fail';
    $output['error'] = 'duplicate';
    $output['rating_total'] = $post_reviews['rating'];
    $output['rating_count'] = $post_reviews['count'];
    $output['html'] = wp_review_rating( $post_reviews['rating'], $commentdata['comment_post_ID'], array( 'user_rating' => true ) );
    echo wp_json_encode( $output );
    exit;
}
add_action( 'comment_duplicate_trigger', 'wp_review_comment_duplicate_trigger' );

We’ll make sure to update this in the future to provide support for older versions of PHP.

Thank you