Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2016.2.0.5972.301 and the 2016.2.1.5995.317 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.12/4.13/4.14 - Wwise 2016.2.1.5995.317

• WG-31588 Fixed: Make sure no sound is played on a dying actor.
• WG-31590 Improved low-memory conditions related to callbacks.
• WG-31860 Fixed: Remove warnings found by clang static code analysis.
• WG-31876 Fixed: Allow relative paths for the Wwise install path.
• WG-31888 Fixed: Potential crash on exit due to accessing deleted FString.