If you have the animation version, you will use the "render sequence" button on that tab to render and save the frames for your animation. This will only work of course if you have animated any of the parameters beforehand.
Briefly:
1. at the bottom of the screen you see a timeline. By default it shows you frame one.
2. open e.g. the lighting node and click on the "S" shaped button next to the "elevation" parameter. Select set animation key.
3. enter 100 at the timeline
4. open the lighting node again and set the elevation to 0. Klich the "S" button again and select set animation key again.
5. open the render node and go to the sequence tab. Select the desired output directory. Click the render sequence button.
Sit back and wait. Your computer will now render a sundown animation in 100 frames and save the images where you specified.
Regards,
Frank
