Import the *.xml and move the included directory 'LikeReview' into library/.
PLEASE NOTE: For educational purpose only. I copied Kier's code, it still belongs to him.
One small thing that's different from Kier's code:
I didn't want to create a custom option so I set the number of maxMostLikedPosts in the controller to be 10.
At least I thought that it would require a custom option, that's why I hardcoded it. Creating a custom option shouldn't be hard, just make sure it's called 'maxMostLikedPosts'.
Oh and you should update the template, for whatever reason the ordered list is displayed inline so that on the screenshot it looks kind of broken.