function _add_upgrade_action_link() {
            $this->_logger->entrance();

            if ( ! $this->is_paying() && $this->has_paid_plan() ) {
                $this->add_plugin_action_link(
                    $this->get_text_inline( 'Upgrade', 'upgrade' ),
                    $this->get_upgrade_url(),
                    false,
                    7,
                    'upgrade'
                );
            }

            if ( $this->has_addons() ) {
                $this->add_plugin_action_link(
                    $this->get_text_inline( 'Add-Ons', 'add-ons' ),
                    $this->_get_admin_page_url( 'addons' ),
                    false,
                    9,
                    'addons'
                );
            }
        }