Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2017.2.2.6553.895 and the 2017.2.3.6575.917 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.17/4.18/4.19 - Wwise 2017.2.3.6575.917

• Added support for Unreal Engine 4.19.
• WG-36727 Excluded WAAPI from Visual Studio 2017 builds.
• WG-36883 Moved occlusion raycasts into an async task.
• WG-37088 Changed to use GEngine->GetFirstLocalPlayerController() instead of UWorld->GetFirstPlayerController().
• WG-37246 Fixed editor crash when starting with -nosound flag.