This addon advertises youtube downloads - which apparently work, but when trying to play the entire file, you´ll notice only parts of it were downloaded. Some files even end up with 1KB of data :-[
Then you´ll get absolutely zero support !! Didn´t find any working link on their website which allows you to send them a feedback or ask for support.

Even video downloads from other pages, for example srf.ch are showing same issues: video content only partially present after download is finished - this is crap

Leaving a negative feedback here seems to be the only contact channel for users

** PLEASE STOP FEEDING THEM WITH YOUR MONEY **
Use yt-dlp instead for Youtube Downloads
And other free available downloaders for other sites.