When I look at my installed version it tells me that it is 64 bit. Older versions as well.
Is your question is in relation to Jaksta being compatible with Mac OS Catalina? I I can tell you that it does run and is compatible. There will probably be some kinks to work out in the near future, but it does work.
We have a new beta that you are welcome to try, which you can get here - https://download.shedworx.com/jaksta/beta/2.2.5_287/JakstaMediaRecorder.pkg
Let me know if you experience any issues that you need help with.
Is there a 64 bit version of Jaksta Media Recorder, the current version 2.25 is 32 bit