1st question:
I believe updating this file will solve it:
https://svn.rubikintegration.com/zen...l_advanced.php

2nd question:
As far as I remember, this module has no sidebox at all. You need to insert a small piece of codes for the xsell items to be displayed under each product. Please check the readme file:
https://svn.rubikintegration.com/zen...ll/install.txt