If you have Win 10 you can always use the Game Mode to record the screen, it can record the full 1080p, if that's the resolution of your own screen, and up to 4 hours with no interruption. That's how I recorded the a-nation 2020.
I might try record it if I don't have to work on the day, since it will be 7am here in Brazil, but I don't know for sure.