Thanks, that was new info and a good tip. Unfortunately it doesn't seem to work in this case. When I'm on the page with the video I want to download and try to download it, the Video DownloadHelper tells me that the companion app needs to be installed even if it is already in the applications folder and I opened it with the tip you gave. It doesn't really open as it's somekind of a extention but I can see that with the tip it did let me double click it which wasn't possible before. This is unfortunate as I really love the software and have been using it on my old MacBook Pro.
Any other recommendations? Why would the app not be verified any more? Any other recommended similar apps?
Huge thank to all! :)