^ All done.
Took some trouble shooting, but found that the problem was simply that home_main.tpl did not have the ezUpsell code implemented in it.
I modified your cart.php to put in the required redirect, updated your home_main.tpl, and ensured that everything is working.
You'll also want to reimplement the language variables as per the installation instructions. If you'd like to PM me admin details I will do this for you also.
Oh, and you may want to also update your signature with 4.0.13
