Hello,
Point is that we are unable to provide support for customizations under our Support Policy https://themeforest.net/page/item_support_policy
So, we have fixed the appearance of the coupon on the single product but if you want anything extra of plugin settings (like displaying coupon on the home page if there is no such option in the plugin) then you need to contact the plugin author with this question.
To fix compatibility we added the below code https://gyazo.com/09c25ef2af241c28b34a682cc9ebec21
Regards