Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2017.2.0.6500.836 and the 2017.2.1.6524.866 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.17/4.18 - Wwise 2017.2.1.6524.866

• WG-34960 Removed min and max properties in AkSlider widget, which are now automatically set via WAAPI.
• WG-35238 Fixed: All open AkEvent Sequencer segments update to dirty when changes are detected in their Work Units.
• WG-35773 Added bounds to theUAkComponent::UseEarlyReflections order parameter.
• WG-35949 Added ability to generate a single SoundBank containing only an Auxiliary Bus.
• WG-36083 Removed WAAPI log spam when generating SoundBanks while the Sequencer window is open.
• WG-36200 Fixed crash when running editor with -game flag.
• WG-36357 Changed Launcher to now copy Visual Studio 2017 dependencies to ThirdParty folder.
• WG-36415 Fixed crash in Unreal when adding new AkSlider in UMG