After some checking, I have found out that iMargin Professional is in fact an iOS enabled application. This means it lacks Android compatibility and I doubt it ever had one. On its official page, you can install the software only for iOS devices like iPhone, etc.
Official page: http://iphone.suisolutions.com/apps/imarginpro/
I don't think the app will be available on Android any time soon, but contact the developers and they should say if it will or not: http://iphone.suisolutions.com/contacts/