Hi – you can update the code by logging into https://www.multilingualizer.com/my-account/ and regenerating the code and installing it in exactly the same way as before. 

The reason this is happening is because China blocks access to certain domain names. In this case, presumably, they are blocking access to jQuery.
To fix it, first upgrade your copy of the Multilingualizer by visiting the my-account area and regenerating the code and then it should work immediately.
If it doesn’t, you can try an alternative source for jQuery. So where you see this line:
<script type=”text/javascript” src=”//code.jquery.com/jquery-3.2.1.min.js”></script>
Replace that line with this:
<script type=”text/javascript” src=”//cdn.bootcss.com/jquery/3.1.1/jquery.min.js”></script>
I’ll grab a copy of jQuery and add it to our own website (China doesn’t block http://www.multilingualizer.com) so that this doesn’t happen to others in future.