Unfortunately, there’s no way to recover the lost password for the beta version of Threema or Threema Work 2.0 for desktop.
You can, however, reset the desktop app and relink the computer to your mobile device: Simply select “Forgot password?” on the login screen of the desktop app, and follow the on-screen instructions. Please note that the messages on the computer will be lost when relinking (but not on your linked devices).
