Kathana Guides
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Solution for common errors

by gynraider9 Aug 20251 min readOriginal thread on Discord
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Step-by-step fixes for client problems after a major Kathana update: verifying game files through Steam, reinstalling and using the launcher's Fix EasyAntiCheat button, and a workaround for the EOS Authentication Unavailable error. Also lists the files (Kathana.txt and the latest crash dump) to attach when submitting a support ticket.

This guide will help you resolve some common issues that may occur after a major update to the Kathana client.

For the most common issues, start by verifying your game files:

  1. Close and restart Steam as an Administrator.
  2. In your Steam Library, right-click Kathana and select Properties.
  3. In the pop-up window, go to Installed Files.
  4. Click Verify Integrity of Game Files.

If verifying the files did not fix the problem, try the following steps:

  1. Make sure Steam is running as an Administrator.
  2. Uninstall and reinstall Kathana.
  3. Launch the game.
  4. When the launcher opens, go to Settings.
  5. Click the Fix EasyAntiCheat button.

If you encounter the EOS Authentication Unavailable error, try the following:

  1. Close the game.
  2. Close the launcher.
  3. Go to the game’s installation folder and run KatahanaGame.exe as Administrator.
  4. You will notice that it does not open.
  5. After that, launch the game from Steam as usual.

If the issue persists, please submit a ticket describing the problem and attach the following files:

  • Kathana.txt
  • The most recent crash dump file (e.g., KathanaCrash_20250809_075909.dmp)