Hello,
I had the same problem,
To resolve it, you should copy in your project the folder "assets/wwise" of the developer's project.
Verify that you have this files : Assets\Wwise\Deployment\Plugins\Windows\...
If you have : Assets\Wwise\Deployment\Plugins\Windows_new, that mean than your plugin isn't installed.
If you don't have acces to the developer's project, create a new blank project, import the wwise integration package, install it with the splashscreen. And copy the wwise folder in your GamJam project.
I hope this helps ;)