1. Where can I see the demo of this addon?
2. How can I get a discount that was announced for current buyers?
Demo isn't available for add-ons due to create confusing with main product & each add-ons. So we are not providing demo for add-ons . We will re-think in future. In this case, you can check the documentation here https://xeroneit.net/knowledgebase/messenger-bot-enhancers/
And about coupon https://xeroneit.net/forum/thread/get-xerochat-add-ons-coupon-codes
We have not released any demo, only demo video available. Watch video demo.