Why am I unable to install the APK file from the Threema Shop?

If you purchase the Threema app from the Threema Shop, you may have to adjust your device’s security settings in order to install and/or update the app.

Android 8 and newer

  • If the dialog “For security reasons, you cannot install unknown apps from this source on your smartphone” is displayed after downloading the APK file from the Threema Shop, tap on “Settings”, and activate “Trust this source”.
  • It is recommended to deactivate “Trust this source” once you have installed Threema.

Android 7 and older

  • Activate “Unknown sources” in your device’s security settings.
  • It is recommended to deactivate “Unknown sources” once you have installed Threema.

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