Get all Users who are not authors

user_query.php

<?php

// prepare arguments
$args  = array(
	'role' => 'author',
	'query_id' => 'wps_not_author',
	'meta_query' => array(
		array(
			'key' => 'wpsand_capabilities',
			'value' => '"author"',
			'compare' => 'not like',
		),
	),

);

// Create the WP_User_Query object
$author_query = new WP_User_Query( $args );