Open the page with the video,
open dev tools of your browser (Ctrl+Shift+I),
select the Elements tab (or Inspector),
search for mp4, you should find a big bunch of text with links and stuff in it.
At that point either copy the whole thing and put it on pastebin.com and post the link to that paste here, or find the highest resolution video URL in that text yourself and post it here.
Either way, we'll be very grateful.