After downloading the files, they get deleted. Result is empty download folder.

[icecat2005]

I have tried several times with and without specifying download folder. I both cases, the output folder is created and I can see the files created while being downloaded. Then they get immediately deleted after trying to merge audio with video.

I get the message that download is successful, but the output folder (default or specified) is empty.

[Riemann728]

I have the same exact issue. The files appear momentarily while the downloading is happening then they just disappear after a few seconds. After the whole download is complete, the output folder [[UNTITLED]] is completely empty.

[BeeBoiii]

install ffmpeg and you should be fine. check out the link below on how to install it.

Installing FFmpeg: https://www.easytechguides.com/install-ffmpeg/

[soraxas]

As @BeeBoiii had mentioned you should install ffmpeg. The latest version (e6d256a) will now avoid deleting the audio/video if mixing failed, but you'd still want to install ffmpeg to have it working as expected.