Dishita's express application really works well and the support is great. I was having difficulty with some downloads not playing properly, turns out it was a codec problem that Dishita showed me how to fix from within the application. If a download fails to play properly (no video, and only audio), try the download again but this time change the video codec (there's a drop-down) to vp09.xx (not vp9). I didn't realize it, but you can change the codec from the "video codec" drop-down. It's very simple.

Consider this fix if you have the occasional video issue, usually for videos > 1080p, but also for oddball videos where you only get the audio in your download. If you don't have any issue after a download, then the default is best and you have no issue. Don't change the codec if you don't need to. If you do need to change the codec, remember the "vp9" codec (if it's in the dropdown) does NOT work, and only the vp09.xx codec does. vp09.xx was the one that worked for all my problem codecs.