I have bought it only a year ago, and have some remarks...
It seems the maker has not much time to update the program and while i like mostly programs made by one person because they are so rock solid, it has drawbacks too...
The continuity can be lost easely. In this case the program really needs an update - it crashes when using two targets. Anders Torger- the maker- is aware of that.
Other than that it seems to work, at least on Mojave.
I think his problem is he cannot make enough money with the software so has to have second job.
The same with the in essence very good other program -Lumariver HDR - that is even more outdated and has more quirks...
So check first if the program works for you before you buy it.