I dunno I am curious around similar thing too, size of early access is 14gig, I am guessing (just my wild guess) that whole game would be minimum 25 gig. Now will it update early access files from 14gig to 25gig or simply place another file in steam library (how it did with enchanted editions) that they simply placed another file for download. That is why we have no in steam library Divinity OS (classic) and Divinity OS EE as two separate games in library.
So if I was you no matter how it will be (update or new file in library) I will still make minimum 30gig space.
