hi,
if you need a quick solution you can run this little script.
It renames alle tables in your Database to og_*
If it was successful you can run the upgrade.
<?php
$host = 'localhost';
$database = 'database_name';
$db_user = 'user';
$db_user_pw = 'password';
$db = new mysqli($host,$db_user,$db_user_pw,$database);
$result = $db->query('SHOW tables;');
$suchmuster = '/^og_/';
while ($row = $result->fetch_row()) {
if (!preg_match($suchmuster, $row[0])){
$db->query('RENAME TABLE `'.$database.'`.`'.$row[0].'` TO `'.$database.'`.`og_'.$row[0].'` ;');
}
}
?>
Henry