Legacy version isn't being updated anymore, this is the up to date version
I don't even think they have act 5 yet do they? and as far as I'm aware legacy means old and outdated. I could be wrong and I won't claim that I know everything I just connected dots, also I thought the difference between the paid and free version was better cgi and added animations, not more acts? I'm apart of the discord and all I've seen was current updates that get launched between all platforms. Please correct me if I am wrong.
Edit: nm you're right it's just for people who already paid via itch.io and is no longer available for purchase here. Also I never realised there actually was a act 5, I feel dumb af right now