I use a free prog called 4K Download. I simply copy and paste the site URL into it and it downloads in either MP4 or (if you choose) sound only. I've yet to find a site it doesn't work on but that's not to say it will work on any site. The prog is (mild) adware but the basic functions are there if you want to just keep the free version and not pay for the full thing.
https://www.4kdownload.com/products/...ideodownloader