This module works with all templates no matter where they come from or who built them.
If you get 500 error you did something wrong in moving the file.
Cherry zen actually does use the html_header.php file in the default folder (all template must for them to work) so by moving it you must have incorrectly placed it.
What you want to do is take the following file:
/includes/templates/template_default/common/html_header.php
copy that to the following location
/includes/templates/[insert your template name here]/common/html_header.php
After you have moved it there make your changes and upload.
If all has been done correctly, it should work just fine with no issues.
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