Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2018.1.6.6858.1242 and the {WWISE_MAJOR}.{WWISE_MINOR}.{WWISE_SUBMINOR}.{WWISE_BUILD}.{UNREAL_BUILD} release of the integration (in addition to upgrading to the new Unreal build).

Note: This integration does not support experimental Unreal Engine 4 features.

Unreal Engine 4.19/4.20/4.21/4.22 - Wwise 2018.1.7.6880.1266

• WG-41693 Added support for Unreal Engine 4.22.
• WG-42262 Ensured occlusion Raycasts ignore PlayerController.
• WG-42728 Fixed: Build issues when plug-in is installed as an engine plug-in.
• WG-42747 Made Spatial Audio options visible in AkComponent properties.