Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2017.2.3.6575.917 and the 2017.2.4.6590.933 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.17/4.18/4.19 - Wwise 2017.2.4.6590.933

• WG-37256 AK::SpatialAudio::SetPortal error incorrectly reported when starting game in Editor.
• WG-37453 Fixed Auxiliary Busses not working in PIE session while running a dedicated server.
• WG-37561 Ensured Room and LateReverb component work properly with the garbage collector.