IS-EO-FAILED_OP_START error in Epic Games Launcher

This error can appear when installing, uninstalling, or verifying a game in the Epic Games Launcher. If you then try to cancel the operation, you may also receive an Unknown Error Occurred message.

To try to resolve these errors, follow the troubleshooting steps outlined below:

1. Make sure that Use Proxy in the Epic Games Launcher is turned off:
   1. Open the Epic Games Launcher.
   2. Click your Profile icon (top-right corner).
   3. Select Settings.
   4. Scroll down to the Use Proxy option and ensure it is unchecked.
   5. Restart the Epic Games Launcher. Refer to How to restart the Epic Games Launcher.
2. Reinstall the Epic Online Services (EOS), you can follow the steps from the article Why am I unable to connect to Epic Online Services?
   • Attempt starting the installation of your game once again for the EOS to trigger automatically.
3. You can also whitelist EOS in your firewall. For additional information, you can also consult Firewall Considerations (Opens in a new tab).

If the error continues, submit a Player Support ticket and include your launcher logs so we can investigate. Refer to How do I gather logs for Epic Games Launcher?