I started playing this game a few days ago and I forgot just how awful the audio is. It's all around horrible. From the dialogue which is often so out of place, out of sync and straight up awkward. To the worst directional sound ever. Sounds like a zombie is on the right and close to you, nope, way off to the left and a mile away.
Seems like some PC players are having serious problems with the update. If there are that many graphical changes, it should be a different version instead of overwriting the old one. I've booted it and messed around. I don't see any changes in the graphics and it plays just fine for me.
This game ran flawless for me on an 6700k i7 and a GTX 1080. I'm shocked there is any need whatsoever of a 40fps mode on PS5 Pro.