Generally, when a free template is first released, other than possibly a few display issues (this positioned over there), the template functions as designed and described. If however, new Zen Cart versions have been released following that point, there may be such issues. We here in the Zen Cart Forum at one point had the free services of a template author where the template's always worked though may have had some of those display issues. That individual for one reason or another hasn't been as active (to say the least) in a while. So, yes, you may see some issues with such a free template in the latest ZC version(s), but the fixes are generally in incorporating the changes that have been made to the base template(s).
All of that also said, there are a few things you will want to become familiar with as you venture into new templates and other code. I don't have all of the links readily available, but a few troubleshooting ones are:
http://www.zen-cart.com/content.php?124-blank-page
https://www.zen-cart.com/content.php...-and-try-again
https://www.zen-cart.com/content.php...s-already-sent
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