Reply To: Need page refresh to see "Select free product"

[Soft79]

Find the following line in woocommerce/assets/js/frontend/checkout.min.js:

$( 'form.checkout_coupon' ).hide().submit( this.submit );

The .submit( this.submit ) part enables AJAX for the apply coupon form. So you could remove that part (WARNING: core change!!!) or find some other workaround for it.