Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2017.1.3.6377.732 and the 2017.1.4.6407.760 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.15/4.16/4.17/4.18 - Wwise 2017.1.4.6407.760

• WG-33333 Removed obsolete code that tried to handle global focus.
• WG-34745 Reduced Lower Engine memory pool size on mobile platforms.
• WG-34879 Exposed the collision channel used for occlusion line trace in AkComponent's properties.
• WG-35035 Ensured setting the occlusion refresh interval to 0 from Blueprint correctly disables the feature.
• WG-35104 In a multiplayer scenario, listeners are now properly handled.
• WG-35463 Fixed: Portals not working on 32-bit platforms.
• WG-35473 Now register game objects only when the world is valid.
• WG-35614 Removed coordinates conversion. See migration_to_2017_1_4 for more information.