I would say run it with windows 10, I'm not sure what else you could do to fix that. Check the options maybe and make sure the volume isn't turned down there, otherwise maybe there was something wrong with the download, so maybe try redownloading.
hmm, i tried both of those. i might just have to watch a playthrough to hear the sound. at least i can still play it fine, and the game visually looks amazing!
i know it's been a while but i fixed the sound! it was an issue with something in my computer, had nothing to do with your game. just wanted to let you know!