The WooCommerce Advanced Quantity plugin lets you control how the quantity field for each product is working.

Demo: https://codecanyon.net/item/woocommerce-advanced-quantity/11861326

https://oload.stream/f/-nQaeTeUgTM/wooadvquant-224.rar
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http://www.mediafire.com/file/x5ryzuj6luyxd5s/wooadvquant-224.rar

This file has UNTOUCHED status – (original developer code without any tampering done)