I try to create/modify a coupon with free produts, but in the Products Tab – Free products form, don’t find any products to add in the all coupon new and old.
Regards
that is a very nasty issue. I sent you a possible fix with WeTransfer, can you please take a look if that works? Also try resetting your permalinks, please.
If it still does not work: Please send me your WooCommerce System Status Report. And, if you are using scripts in functions.php, please send them to me. Thanks.