The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
This app was great for stores just starting out. It is not free. When I installed it, they sent me a message saying they would charge 3% for sales on the upsell. Ok, I was fine with that. 3% is very small. Then I go to add another upsell to find it is now a paid app, also fair enough, but without warning they have deleted the upsells I had, no word to say it is now paid, and they will start charging. It all seems a bit scammy too me. it is still advertised as a free app.