Licensing and Price on PC from MS Apps Store

I started Hue Essential on my iPhone, which i make purchased for the feature and multiple bridge support. And I found out later it is also available on the PC, so I installed it from the Microsoft Apps store, but I have not yet purchased the enhancement/add-on. Here is my question: I have not used the MS Apps store before ;( Do I have to pack for each enhancement/add-on for every PC install instance of Hue Essential or just once using the same account? As of right now, while I am exploring and working out some network issues (multiple bridges and some wifi issues), I will probably end up installing the app on two different PC (192.168.10.### and 192.168.20.###), is that mean I have to pay twice?