Hi,
You will need to purchase an upgrade to Chaotica 2.0 to licence the 2.0 betas. You can do this from your private order page.

How much is it for the upgrade license?

Can we have option to disable video encoding? Seems like unnecessary wait even with lowest bitrate and filesize.

I second that.
Also it would be great to be able to move the camera around in the main window.

Sure, will add an option.

it is 45€

I'd also ask to disable automatic image update while rendering because at higher resolution when I make a few seconds video that update seems to slow down the overall speed of large png files being saved.

Seems like minor issue and very specific to your hardware.

If rendering 10 seconds or 300 frames of 4K resolution video each time after a frame is saved it updates the image on-screen... it does take extra time 2-3 seconds to complete that and move on to another render. It may be minor but does stack up in time spent.

Program needs to update the image, save it and start another render for next frame. It might take only little bit more time on slower machines but difference is negligible.
I have rendered 250 000+ frames with these beta releases and there is more important things to change.