In my older review I gave 5 stars to application, but after author decided to make money and released "semi-free" version that is crippled to unusable state, he lost two stars from me. He took advantage on people who helped him debug and improve application because it was free.
Most of the reviews here are posted while actually free versions were available.
Try to find version 6.8. That is the last actually free, fully functional version. Not polished as current version but more than good enough.
Your use case is exactly what EposVox demonstrates: he fine tunes cam settings and shows the changes live in his OBS. So have you considered that there is a chance that something is wrong with your setup? Like an orphaned or poorly programmed driver reporting back incorrectly?
And your attitude wasn't helpful either: see, other users simply asked for support, which they got - for free so far, and I managed to fix all (!) of the issues. So, what is it you want? Just tell people that the countless number of hours of work I invested aren't worth 5 bloody bucks?
Here is my peace offer: tell and show me exactly what kind of crash you encounter and I'll do my best to fix that one as well.