*/
        if (version_compare($this->currentVersion, '14.10', '<') && (Option::get('link_tracker') || Option::get('download_tracker'))) {
            Option::saveByAddon([
                'link_tracker'            => Option::get('link_tracker'),
                'download_tracker'        => Option::get('download_tracker'),
                'latest_visitors_metabox' => '1',
            ], 'data_plus');
        }

        // Clear not used scheduled.
        if (function_exists('wp_clear_scheduled_hook')) {
            // Remove unused cron job for purging high hit count visitors daily
            wp_clear_scheduled_hook('wp_statistics_dbmaint_visitor_hook');

            // Remove referral db update cron
            wp_clear_scheduled_hook('wp_statistics_referrals_db_hook');
        }

        /**
         * Update old excluded URLs to the new structure with explicit wildcards.
         *
         * @version 14.10.3
         */
        if (version_compare($this->currentVersion, '14.10.3', '<') && Option::get('excluded_urls')) {
            $updatedExcludedUrls = $this->updateOldExcludedUrls();
            if (!empty($updatedExcludedUrls)) {
                Option::update('excluded_urls', implode("\n", $updatedExcludedUrls));
            }
        }

        if (!Option::get('schedule_dbmaint') && version_compare($this->currentVersion, '14.15.5', '<')) {
            Option::update('schedule_dbmaint_days', '0');
        }

        if (Option::get('schedule_dbmaint') && version_compare($this->currentVersion, '14.15.5', '<')) {
            Event::reschedule('wp_statistics_dbmaint_hook', 'daily', DateTime::get('tomorrow midnight', 'U'));
        }
    }

    /**
     * Updates old excluded URLs to the new structure with explicit wildcards.
     *
     * @return array updated URLs.
     */
    private function updateOldExcludedUrls()
    {
        $updatedUrls = [];

        foreach (explode("\n", Option::get('excluded_urls')) as $url) {
            $url = wp_make_link_relative($url);
            $url = trim($url);

            // If the URL contains a query string, strip it
            $url = explode('?', $url)[0];

            // Trim leading/trailing slashes
            $url = trim($url, '/\\');

            // If the URL doesn't end with an asterisk (*), add one and make it a wildcard
            if (substr($url, -1) !== '*') {
                $url .= '*';
            }

            // Add the URL to the new list if it's not similar to others
            if (!in_array($url, $updatedUrls)) {
                $updatedUrls[] = $url;
            }
        }

        return $updatedUrls;
    }
}