was contacted by the developer to organise the app but unfortunately didnt work out, as we just couldnt agree on giving backend access.
First of all thanks for trying out the app.
The app works with every theme, but since all themes are different and many are customised the automatic installation does not work with all stores.
The snippet is freely available in the app itself, the problem is without seeing your code, I wouldn't be able to tell you where to insert it.
I'm sorry that you prior had a bad experience with a different developer. I always make sure not to tinker with any of my merchants code.
I find the review a bit harsh since i did everything i could to help you.
Anyways best of luck with you store in the future :)
You're welcome back anytime.