This error occurs when the launcher tries to asynchronously deserialize a manifest when there is a mismatched hash value.

Windows

  1. Exit the Epic Games Launcher entirely by right-clicking on the tray icon and selecting Exit.
  2. Navigate to the following directory: C:\Users\username}\AppData\Local\EpicGamesLauncher\Saved\Config\Windows
  3. Open the Engine.ini file in a text editor.
  4. Edit the file to include the following:
    [Launcher]
    ForceNonSslCdn=false


    Note: If the file has the above entry saying true change it to false. If you don't see the above entry at all in the file then copy and paste it into the file.
  5. Save the file.
  6. Try launching the Epic Games Launcher.

Mac

  1. Exit the Epic Games Launcher entirely.
  2. Navigate to the following directory:
    /Users/{user name}/Library/Preferences/Unreal Engine/EpicGamesLauncher/Mac/
  3. Open the Engine.ini file in a text editor.
  4. Edit the file to include the following:
    [Launcher]
    ForceNonSslCdn=false


    Note: If the file has the above entry saying true change it to false. If you don't see the above entry at all in the file then copy and paste it into the file.
  5. Save the file.
  6. Try launching the Epic Games Launcher.