Looks like a Java App.
3 different versions/editions;
It looks like you need to buy a 'maintenance contract', equals 20% per year. This seems to mean you get technical support and even updates or service updates. Gosh.
Apart from the "Reference other projects' model elements" features (not avaialble in Modeller Version - this looks like it could achieved in XMind or similar.
I'm going to demo and find out.