I found some youtube videos can't be downloaded from time to time.
please take a look of this one:
not only Jaksta, but I also tested other software, they all not working properly unless I download the video and audio separately.
This is an age restricted video. I am aware there are currently issues with extracting these starting afew days ago with youtubes latest changes to their site.
Whilst Im working on a fix you can remove.
from Settings > Internet Downloads > Advanced > Extractor tab > The following media urls will be ignored
And then use AUTO mode. This will allow AUTO mode to pick up the media stream played in your browser.
You've been amazing <3