use the fixes that are found in a couple pages. use the most recent fix of this (if your using the old version then get the fixes)
If I'm up to date with the news, the development for the new update is on hold with the entire team, since they have lives and an important member is also making another mod. It's better to just wait.
I got sound to work by loading in the vehicle then going to audio settings and turning on stereo audio and turning it off.