For the first part, you always set the SoundBanks from Wwise, and it doesn't have to be in the Assets/Streaming folder anymore, as long as you've got the "Enable copying of soundbanks at pre-Build step" option selected in the Wwise Settings in Unity.
In WAG, we use the folder WwiseAdventureGameSource > GeneratedSoundBanks folder. If you just downloaded it, make sure the folders are structured like this...
... and you should see the generated SoundBanks in there.
For the second question, you should see a secondary menu on the right side when pressing ESC. That's where you jump to a certain quest. So if you'd like to listen to the Final Reveal, you should:
- Press ESC > Teleport to the core.
- Press ESC > In the Quest Navigation" menu you click the sphere next to quest 8, then 8.1 and lastly 8.2.
If you do this repeatedly, you can also move the Player gameObject closer to the core when in edit mode, and you won't have to teleport.
Hope this helps!