Missing sound effects

[MrSparkle001]

I'm missing a few sound effects. The skeleton pet's sit/stand sound is gone (it's supposed to sound similar to the death sound, but now there's no sound at all), I can't hear rain or thunder, and it seems a few other effects are missing but I can't quite place them.

I used Duxa's All In One Installer and installed the sound option (7) for enhanced sounds before playing the first time but I don't know how to revert it to see if that's the problem.