remove_filter() for the parent theme’s function. Then add your child theme function, like the parent theme does. (Although, it might not be quite right because child functions.php runs before the parent functions.php, so you may need to remove the parent filter if a different place.)
But this theme doesn’t show up on the WordPress themes page, so you should be asking this question somewhere else.
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]]>As the author is aware, commercial products are not supported in these forums. I am sure they will have no problem supporting you there.
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