Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the 2019.1.0.6947.1305 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 4.21/4.22 - Wwise 2019.1.0.6947.1305

• Added support for Unreal Engine 4.22