Since the update, there has been this error:
erreur: Fatal error: Class XoopsMySQLDatabaseSafe contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (XoopsDatabase::exec) in C:\wamp64\www\Xoops\XoopsCore25\htdocs\class\database\mysqldatabase.php on line 488

I'm resolving it as we speak, in #1572
Still doing some minor testing and I should finalize it in the next couple hours (hopefully)

Great, thank you!

In order to be able to work while waiting for the correction, I added:
public function exec($sql) { return $this->queryF($sql); }
in:
class XoopsMySQLDatabaseSafe extends XoopsMySQLDatabase and class XoopsMySQLDatabaseProxy extends XoopsMySQLDatabase

It's merged now, so please give it a try and let me know if you see any strange things and bugs!
Thanks!

Everything seems to be working!