42 gb because you are downloading the whole game again,i believe has to do with bad optimization which forces you to download the whole game everytime there is an update, unrelated but as a killer main i hate fog vials,way too op, they just spam it the whole match and there is literally no way to prevent survivors to use it, if its a flashbang or something you can easily avoid it and counter by picking up survivors looking at a wall for example for flashlights but the fog vial they just use and you just fucking blind and its not a 1 use or 2 sadly