I checked the download, and all of the includes/templates/YOUR_TEMPLATE/templates/ files are missing the
<div class="centerColumn" id="nameofpagehereDefault">
at the beginning of the file
and the closing </div> at the end of the file.
That is the standard way includes/templates/YOUR_TEMPLATE/templates/ files are enclosed in zen cart. My template (and others might too) relies on that being there, and it also gives people a way to style the content of each page with css, since each page is given its own unique id.
I think perhaps not every single page in that folder needs that added, since some of those pages (like tpl_faqs_next_previous.php) aren't necessarily responsible for the whole pages content, just a portion of it. I'm pretty sure all of the files in that folder that end in _default.php need it added, though.
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