So every now and then I like to scan through the Twitterverse and every now and then I come across a video I like to download. None of my down loaders on my computer seem to be capable of downloading Twitter videos. I was trying to find a program but decided to use an online service instead.
So first to Twitter, go to the video you want to save. In this case I using a video posted by George Takei. It's about a movement asking people to storm Area 51.
When you find your video, right click on it and click on Copy Video Address.
Then go to a site like https://www.getmytweet.com/ and in the bar that says Enter the Tweet URL..., right click and paste. Now click on the Blue Download button.
Then you'll get taken to a page with a few download links. Just right click on the video you want to download, the larger size usually indicates better quality.
So right click and look for an option like my example using Opera - Save linked content as...
And just choose your name and folder where you want to save it on your hard drive. If you just click on the link, in this case, it opens the video in a new tab and starts automatically playing it. You can still save it at this point by right clicking on the video and look for an option similar to Save video as... (as Opera list it)
I tried a few of these sites and they basically seem to operate the same way.
By the way that video address: https://twitter.com/i/status/1149869807682117632