Works out of box

I installed and tested this plugin, works great without any issue. It has unique set of features like block layer upon submission from frontend, in backend we can see the detailed information about the subscribers and as soon as product in stock it send mail to the subscribers in a background without affecting page speed. I already bought 3 add-ons (all 3 just $15)
1. Unsubscribe
2. Ban Emails
3. WPML

Kudos to the developers ??

Thank you.