Yeah, try it with Firefox. Couldn't hurt. You don't need to buy a license to use VDH.
All a license does is skip the step that adds the watermark. So whatever you download
will have the watermark. But it might be worth trying. If it fails in Firefox, you
could try downloading with ffmpeg. Instructions are here:
https://groups.google.com/g/video-downloadhelper-q-and-a/c/BzPLK2YyL-s
Do a string search on "cannot download" within that thread & you'll find a link to the
instructions.
You should also verify whether the items are protected by DRM. We just had a discussion
in which that was an issue.
https://groups.google.com/g/video-downloadhelper-q-and-a/c/keGg0hjlVr0
There's pictures in there of how to figure out if the content is protected by DRM.
If you're totally stumped, post screenshots of what you see step by step. Walk us
through your process. That's the best we can do since your content is behind a paywall.
Do the equivalent of letting us look over your shoulder while you try to download this
content.