Cyberpunk 2077 Fix: “RED4ext.SDK” Error After 2.13 Update

Are you stuck staring at the dreaded “RED4ext.SDK” error message when you try to launch Cyberpunk 2077? This common error usually pops up after a game update and can be fixed by updating your mods.

Cyberpunk 2077 Launch Issue: “RED4ext.SDK” Error (Fixed!)

Here’s what’s happening:

• Mod Mismatch: This error means a mod you’re using, especially a framework mod, isn’t compatible with the latest Cyberpunk 2077 version (2.13). These framework mods rely on specific memory addresses to work, and those addresses change with updates.

Let’s fix it! Here are some solutions:

1. Update Your Mods:
   • This is the most likely solution. Use a mod manager like Vortex to do a full mod check for updates, not just the quick one. Pay close attention to framework mods like Red4ext, Cyber Engine Tweaks, and Archive XL.
   • After updating, make sure the mods redeploy without any errors.
2. Clean Install (if needed):
   • If updating mods doesn’t work, consider a clean install. This means manually deleting leftover mod files after uninstalling the game. You can find a detailed guide on CD Projekt Red’s website: https://support.cdprojektred.com/en/
3. Verify Game Files (Optional):
   • While less likely to fix this specific error, verifying your game files through Steam can address potential corrupted game data.

Bonus Tips:

• Double-check Mod Compatibility: Make sure your mods are compatible with Cyberpunk 2077 version 2.13.
• Remove Redundant Mods: If a mod update installs separately from the old one, remove the older version manually to avoid conflicts.
• Beware the FSR3 Framegen Mod: This mod might be causing problems after the 2.13 update.

By following these steps, you should be able to defeat the “RED4ext.SDK” error and get back to exploring Night City in style. Remember to keep your mods updated to avoid future issues.