I cannot explain how to download but you can download every single video not just hers for free using "SAVE VIDEO AS" when it starts playing, you can also select the size 1080 i believe is best on this site. I have never gotten a virus even though my software says this and that about objects. Its tricky to get started but once you figure one out the rest are easy.
UPDATE, click on video, let it load, a little bit up from lower right is skip add button, play, select quality and right click and hit save as, there you go, works with all models on site and there are tons