Edit your includes/templates/YOUR_TEMPLATE/templates/tpl_modules_also_purchased_products.php (if you don't have that file there, then copy it from template_default)
Find line 17 and change from
Code:
<?php if ($zc_show_also_purchased == true) { ?>
to
Code:
<?php if ($zc_show_also_purchased == true && ($current_page_base == 'index' and $cPath != 'YOUR_CAT_ID') ) { ?>
Replace YOUR_CAT_ID with the category ID where you don't want to show APP. I haven't tested, but it should work... Hopefully, you'll tell us if it does.
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