Hello,
We did not test such plugins officially with our theme, but you can try the next plugins –
http://wordpress.org/plugins/woo-min-max-quantity-limit/
https://wordpress.org/plugins/minmax-quantity-for-woocommerce/
https://woocommerce.com/products/minmax-quantities/
If every one of these plugins doesn’t work, select 1 of them and provide temporary wp-admin and FTP access, we will check what can be done to help you from our side.
Regards















