.NET framework not found while trying to run Batman AA from Steam.

Question

Answer 1

Hi,

Search for Windows Features and open it. The Turn Windows features on or off dialog box will appear.

Check the .NET Framework 3.5 (2.0) option and click OK. It will ask where to download it; select Windows Update.

Wait for the process to finish and restart your PC.

Let me know if it worked.

Thanks

Answer 2

That dialog indicates the game launcher is looking for an older .NET Framework version and the app cannot start because the required .NET component is missing or the .NET Framework installation is corrupted.

Try these steps on Windows 10:

1. Click Yes in the prompt and see whether Windows installs the required .NET component.
2. If installation does not complete, repair the installed .NET Framework by turning the feature off and back on:
   • Open Start and search for Turn Windows features on or off.
   • Clear .NET Framework 4.8.
   • Select OK and restart the PC.
   • Open Turn Windows features on or off again.
   • Enable .NET Framework 4.8.
   • Select OK and restart again.
3. Run Windows Update and install any available .NET Framework updates.
4. Try launching Batman: Arkham Asylum again from Steam.

If the game still does not start after that, the issue may be with the game files or other missing dependencies. In that case:

• Verify the game files in Steam.
• Reinstall the game.
• If it still fails, contact the game publisher or Steam support.

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References:

• "This application could not be started" error when running a .NET Framework application
• Application failed to run due to missing .NET Framework - Microsoft Q&A
• Could not load file or assembly. I don't know how to fix it... as a person who doesn't even understand what is this error I need someone's help. - Microsoft Q&A