Edit File: upgrade-section.php
<?php /** * Upgrade section template. * * @since 3.7.3 */ defined( 'ABSPATH' ) || exit; ?> <p> <?php esc_html_e( 'You can use WP Rocket on more websites by upgrading your license (you will only pay the price difference between your current and new licenses).', 'rocket' ); ?> <button class="wpr-license-upgrade-button wpr-popin-upgrade-toggle"><?php esc_html_e( 'Upgrade now', 'rocket' ); ?></button> </p>