1. When requesting support please report the version of Zen Cart you are running and the mod version you have installed.
2. The tpl_checkout_payment_default.php was just for those having issues with Google Checkout label displaying on the Zen Cart payment checkout page. But since you could not get mod to display at all, not sure why you replaced that page?
3. It appears you have not uploaded the mod template files to your proper template directory. What is the name of your template? "classic"?
Woody
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