There are many programs you can use to download your highlight video from youtube. My favorite is KeepVid

To use KeepVid all you do is paste the link for your video in to box and click Download. (Ignore the AD that says content can't be played).

Then click Full Video - 720p. 

And it converts the video for you. You just have to choose to DOWNLOAD the video and a pop-up SAVE window will appear.