Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2017.2.6.6636.979 and the 2017.2.7.6667.1010 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.17/4.18/4.19 - Wwise 2017.2.7.6667.1010

• Added support for Unreal Engine 4.20.
• WG-38486: Fixed: Crash when removing an always-loaded level that uses AkRoomComponents and/or AkLateReverbComponents.
• WG-38608: Added experimental support for Lumin.
• WG-38676: Fixed: Changing Spatial Audio Volume shape makes Unreal Editor freeze.