How to fix the Repair message when trying to install/launch Kerbal Space Program?

If you're getting a Repair message when trying to install or launch the Kerbal Space Program you might not have the correct Language pack installed.

To fix this, please try the following:

1. Start the Epic Games Launcher.
2. Go to Library.
3. Click the "..." Button.
4. Click Options.
5. Choose the correct Language pack.
6. Click Apply.
7. If the issue persists, try selecting all available language packs during installation.