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How can I combine the audio and video files from youtube downloads when they don't automatically combine?

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I'm using YouTube Video and Audio Downloader. Sometimes the audio and video files combine automatically, sometimes they don't - remaining as separate " DASH - .m4a and DASH - .mp4 ". It used to be that when this would happen I could open up a "ffmpeg" window which would allow me to "manually" convert them to a combined .mp4 file. It was a "drag and drop" type of interface. For some reason I can no longer access that ffmpeg combining function. I tried clicking on ffmpeg.exe. I tried re-downloading ffmpeg several times, both from the Downloader options tab and from the ffmpeg website. Thanks for your help.

I'm using YouTube Video and Audio Downloader. Sometimes the audio and video files combine automatically, sometimes they don't - remaining as separate " DASH - .m4a and DASH - .mp4 ". It used to be that when this would happen I could open up a "ffmpeg" window which would allow me to "manually" convert them to a combined .mp4 file. It was a "drag and drop" type of interface. For some reason I can no longer access that ffmpeg combining function. I tried clicking on ffmpeg.exe. I tried re-downloading ffmpeg several times, both from the Downloader options tab and from the ffmpeg website. Thanks for your help.

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Sounds like a question for the developer of the video download add-ons that you have installed.