I can't find it.
Viewing post in Scratch Island (Online World) comments
If you check to see in the “development logs” there are two different ones which have .zip files. At the bottom, just above the Comment section, they link to:
Christmas Update most recent
and:
Both have .zip at the bottom of the post. Except, they look like links, but right now they don’t seem to be working.
That could be a thing to pop into the Discord to ask about… I’m fairly sure I actually downloaded this at some point. Though I can’t say how (maybe through the itch.io app?)