hi @H6D6S, Thanks for your detailed response which will help Epic Support Engineer.
Forgot to say that used the 64 bit version with “Run As Administrator”.
On Windows 11 the installation of Fortnite/UEFN MUST use Run As Administrator for the first time.
Here is the error from Epic Support extract
To fix errors.com.epicgames.pre-processing.download_failure, run the Epic Games Launcher as an administrator, verify your system’s internet connection and check the Epic Games server status, and ensure your system meets the game’s minimum requirements. You may also need to close background applications that could interfere, verify the integrity of your game files, or reinstall the Epic Games Launcher.
Run as Administrator
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Close the Epic Games Launcher completely.
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Right-click the Epic Games Launcher shortcut.
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Select “Run as administrator” and try the download again.
Check for Issues
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Internet Connection: Confirm your internet connection is stable.
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Server Status: Check Epic Games Store to see if there are any server issues causing the problem.
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System Requirements: Make sure your computer meets the game’s system requirements.
Advanced Troubleshooting
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Close Background Applications: Exit any non-essential programs running in the background.
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Verify Game Files: If the error occurs during a game update, look for an option within the launcher to verify the game files’ integrity.
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Reinstall Launcher: As a last resort, you may need to uninstall and reinstall the Epic Games Launcher.