Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the 2019.1.0.6947.1299 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.21 - Wwise 2019.1.0.6947.1299

• WG-31477 Added Project Settings options for configuring the generated SoundBank folder.
• WG-36379 Exposed initialization settings via the UI.
• WG-36438 Modified AnimNotify_AkEvent to log a warning when it creates the AkComponent. For more information, see Animation.
• WG-37825 Exposed GetRTPCValue to Blueprint.
• WG-38260 Exposed initialization settings to the UI.
• WG-38693 Fixed: (WAAPI) Race condition in AkAutobahn, as used in various integrations and samples.
• WG-40368 Fixed: AK::SoundEngine::SetSpeakerAngles parameter in_pfSpeakerAngles. It is now const AkReal32* instead of AkReal32*.
• WG-40554 Made the SoundBank generation process non-blocking.
• WG-40869 Added a new Blueprint function, SetMultipleSpeakerEmitterPositions, which works like SetMultipleChannelEmittePositions but directly accepts a speaker mask instead of a channel configuration.