Do you have any Insteon Controller working with Indigo 7? Like a 2413 Series PLM or through an ISY994i? You need an Insteon controller to receive the Insteon Leak Sensors, Insteon RF messages and pass them to Indigo 7.
I remember that I used Indigo 7. This was one of the first software to control your smart home system. It was like a WOW for me, when I installed it in my house. Nowadays, it's very important to have a smart house system that will take care of your water from the house. In this question, I was helped by qualified plumbers from Sydney. They came with a lot of ideas for my house. So I liked the fact that I had a big variety of options to chose from. Anyway, I think that installing such a system is very worth it.