.-.-.-.-.-

<?php

use Joomla\CMS\Factory;

class pkg_yoothemeInstallerScript
{
    public function preflight($type, $parent)
    {
        $php = '5.6.0';

// abort if PHP version < 5.6
        if (version_compare(PHP_VERSION, $php, '<')) {
            Factory::getApplication()->enqueueMessage("<p>You need PHP {$php} or later to install the template.</p>", 'warning');
            return false;
        }
    }

public function postflight($type, $parent)
    {
        // updateservers url update workaround
        if ($type == 'update' && $parent->manifest->updateservers) {

$db = Factory::getDBO();
            $servers = $parent->manifest->updateservers->children();

$db->setQuery(
                "UPDATE `#__update_sites` a".
                " LEFT JOIN `#__update_sites_extensions` b ON b.update_site_id = a.update_site_id".
                " SET location = ".$db->quote(trim((string) $servers[0])).', enabled = 1'.
                " WHERE b.extension_id = (SELECT `extension_id` FROM `#__extensions` WHERE `type` = 'package' AND `element` = '{$parent->getElement()}')"
            )->execute();

}
    }
}

/home/locationbo/www/administrator/manifests/packages/yootheme/script.php