On the link you have three downloads the last one is the MML.
This set can be used as seasonal if you include the MML. If thats in your plugin folder you need to plop one piece (its in the health menu) and wait a month or so and the other pieces will appear.
If seasonal is not required then you can leave the MML folder out and all the pieces will be available.
Hope its clear, if not, i'll try and explain it better, just let me know!