I'm having this issue as well, typing the location manually does nothing. It was working perfectly last week and now I open the launcher and it tells me to 'upgrade wwise in project' but won't accept the Unity app.
Neither of my Unity or Wwise versions have been changed.
Unity version 2017.3.0f3
Wwise version 2017.2.2.6553
Can anyone help, my project deadling is in 2 weeks :'(