Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2017.1.7.6467.822 and the 2017.1.8.6488.843 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.15/4.16/4.17/4.18/4.19 - Wwise 2017.1.8.6488.843

• LAUN-858 Fixed: Install both Visual Studio 2015 and 2017 Wwise SDKs in the Unreal project.