Unable to download using aria2c
Downloads can be performed normally even with aria2c disabled. Enabling the aria2c function will cause it to get stuck at the downloading stage.
That doesn't mean it got stuck, it's probably downloading but not displaying a progress because the download is fragmented. Take a look at this comment for an explanation: https://github.com/ErrorFlynn/ytdlp-interface/issues/226#issuecomment-3504485548 You can verify that by looking at the yt-dlp output (click the "Show output" button or press Ctrl+Tab).
I was unable to reproduce this with the video in your screenshot (it displayed % progress for me, and the download finished normally).