I got HTTP 500 when trying to download anything using the demo site. Not sure if the server is overloaded, or a bug (would non-Latin characters in title affect

I got HTTP 500 when trying to download anything using the demo site. Not sure if the server is overloaded, or a bug (would non-Latin characters in title affect anything?) The video I tried is https://www.youtube.com/watch?v=5-X_2VXpEds https://www.youtube.com/watch?v=5-X_2VXpEds and I just set a start and stop time.