Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the Unreal Engine 4.5 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.5 - Wwise v2014.1

• UI-172 Fixed: Resolved assert created by the AkReverbVolumeChannel collision channel.
• UI-174 Fixed: Optimized the "Generate SoundBanks" window.
• UI-175 Fixed: Added preprocessor guards to remove compilation errors on platforms not supported by this integration.