@eva

You should be able to use the Syphon output from stage setup to allow OBS to grab the input. 
Using OBS is a good choice for big video like this, it allows completely separate cpu/gpu processes to deal with the video recording, which will ensure Isadora provides the best possible playback
Yes, set OBS to record at the speed you set the Isadora framerate at.
Since you are on Mac you could try Syphon recorder, it may be the easiest option. Syphon Recorder | Syphon

I solved it for now

@kolmon3853

I work in a similar situation. It seems to me that you probably want 2 licences. That said, do you know that you can rent a licence for a short term? It's really cheap and easy to deal with. It also then put the onus on the other party to rent it and pay for it, should that be a thing.

Pricing for Isadora 4 and IzzyCast : TroikaTronix

Cheers,

Hugh

BTW, do the upgrade - it's well worth it.

@mr_j

I'm not seeing the exact same behavior as you, but something similar. I am able to close Isadora Settings, but I do see that on newer versions of macOS, this causes an eternal popup that can't be closed for me, so I'll log that.

Best wishes,

Woland