Hello Davide,
Yes, there's a bug in the Launcher for playing the builds both for WAG and WAL, but I know they're working on fixing it.
In the meantime, please open the executable game builds from Explorer or Finder.
On the sample pages, we also discovered that the "Open in Wwise" button might open up the Wwise project with a much newer version, that wouldn't allow for generating SoundBanks to the samples. So for Wwise projects, please temporarily open them from the Projects tab.
Thank you for your patience!