Just download the Developer master version, they keep this updated almost twice daily and they’ve already solved the engine sound issues a couple of days ago. The stable version won’t be updated until any bugs and improvements are validated and it’s usually after a patch update to make sure the next stable release is compatible with the patch.
Otherwise, just download the developer (master) version. There’s a new engine sounds that’s actually more accurate to real life engine sounds and it purrs like a kitten.