Don't remove if. Edit it to be:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.3/jquery.easing.min.js" type="text/javascript"></script>
https
For your captcha, check over any template override files. I've seen where a template override was an older version or just missing something that belonged in the current version of Zen Cart. In some cases, switching to the default template works but not in this case since template overrides are required.



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