Dolphin Heat Exchanger USA

Why the app not working? If i click on app from admin then it shows "Redirecting to installation page..." and it never move further, i was kep monitoring till 30 minutes then nothing change

I am on trial and app is very complicated, no proper support on chat. Only email and many things not get clear. However guide is there but my experience it is not easy enough to get expected output The app listing does not offer "chat" as a supported channel for customer support. This should not be a surprise. Immediately after a merchant installs this app, an email is sent to the store owner's email address with instructions on how to contact our support staff. By phone: 404-369-0680 x2, by email: support@eniture.com. This merchant didn't take advantage of either of these avenues.

I am using this app long time ago and it is working fine but now unable to add watermark? Is there any limit in free plan ?