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I need a video for my school project. Do you know how to download it?
You can try using this webpage I found: https://fdown.net/
Paste in the Facebook URL you snagged by selecting Copy Link from the ellipsis menu. The site will parse all content for you and provide links to grab either the "Normal Quality" version (the same as you get with the steps above) or an "HD Quality" video. You can click the links or right-click to select Save link as. The More Options box can try to force a standard definition or high-definition download, and also do an audio fix.
Hope this works! :)