I have version 18.104.22.168 installed and the latest WP version. I have imported some 9.100 coupons into the system and everything is working smoothly with them. I have epub files on some ebook products that the user can download using a coupon code (100% discount). When the user has selected his item in the shopping basket and inserted the coupon and filled out all info about himself he clicks the Buy button but gets redirected to the first step of checkout (i.e. the coupon insertion page).
What the hell can be wrong here ?