Unfortunately our Jaksta apps are only compatible with Mac OS X 10.10 and above.
Thanx in advance,
An alternative that we offer and that should work with your old OS (only just remembered that it is compatible with 10.8) is Jaksta Screen Recorder - https://www.jaksta.com/products/mac/jaksta-screen-recorder
Rather than capturing a stream it records what is on the actual screen. It's not as convenient as Jaksta Media Recorder and it does record in real time, so it needs to be left to record. But the end result is fairly similar.
Outside of Jaksta, I am not actually aware of any other good quality stream capturing software so I am not able to recommend anything unfortunately.