Well the notes do advise it is for 32 x 32, but in saying that, I have dabbled in adding code for 64 x 64 collision masks, but using 32 x 32 tiles. It's still not something I'm completely happy with, as there are a couple of bugs to iron out. If I can get them sorted I'll release it though.
Viewing post in Tile Based Moving Platform Engine for Gamemaker comments
Here's an update on what I've been working on. I have easily added 64 x 64 masks into the collision system, but the circular moving platforms are still not perfect with these larger masks. I have other projects I need to complete right now, so need to put this update on hold, but I will come back to it in a few months when I have time.