Apex Legends Unknown File Version [Fixed]

We can solve it quickly if you get an "Unknown File Version" error in Apex Legends. 👍


Apex Legends, a multiplayer shooter that combines the principles of battle royale titles like Fortnite and hero shooters similar to Overwatch, became the biggest hit of the season overnight when it appeared in 2019. Like all newer games, Apex Legends is not immune to sporadic errors that appear and lead to the game being unable to start or constantly crashing. One such error is Unknown Version Engine Error in Apex Legends which usually occurs after updating the game. The game won’t start or will crash because it will point to a specific file causing problems. Fortunately, the error is not unknown and new, so we have prepared well and explained to you in this guide how to fix the problem.

Why do I get an Unknown file version error in Apex Legends?

Have you wondered what causes the unknown file version error in Apex Legends? We will single out several of the most common reasons for:

  • game server issues
  • unstable internet connection
  • corrupt or missing game files
  • outdated GPU driver
  • conflict with a firewall or third-party antivirus

How do I fix unknown file version on Apex?

It would be a good idea to consider these simple steps first:

Still having a problem? Then do the following:

  1. Verify and repair game files
  2. Disable firewall and antivirus temporarily
  3. Update device drivers
  4. Repair system files
  5. Reinstall Apex Legends

1. Verify and repair game files

Time needed: 3 minutes

We recommend you check the game files’ integrity, likely solving the Apex Legends unknown file version error problem. The file integrity check procedure will check all game files and replace damaged or missing files, if any.

  1. Launch the Steam client

    Navigate to the Library to locate Apex Legends game.Apex Legends Library

  2. Right-click on Apex Legends 

    Select Properties from the context menu.Apex Legends Properties

  3. Navigate to the LOCAL FILES 

    Click on the Verify integrity of game files. Wait until verification is complete.Apex Legends Verify FIles

  4. Restart your PC

    Launch Apex Legends to check if the “Unknown file version” error is gone.

2. Disable firewall and antivirus temporarily

Windows firewall and antivirus can cause game problems if not set up correctly. For the firewall, you have two options – allow the game through the firewall or temporarily disable the firewall. We advise you to find a faster way to temporarily disable the firewall and see if the error is solved this way. Do the following:

1. Press the Windows + R keys on your keyboard to launch the Run dialog.

2. Type; firewall.cpl and press Enter.

Run command for firewall

3. Select Turn Windows Defender Firewall on or off.

Apex Legends Unknown File Version - Turn Off Windows Defender

4. Tick all radio buttons – Turn Off Windows Defender Firewall. 

Firewall 3

5. To disable antivirus, right-click on Windows Start and select Settings.

Run Settings

6. Choose Update & Security from Windows Settings.

Windows OS Update

7. Select a Virus & Treat protection and then Manage settings.

Apex Legends Unknown File Version  - AV disable

8. Toggle OFF Real-time protection.

Apex Legends Unknown File Version - AV toggle Off

If you use a third-party antivirus such as Avast, Bitdefender, Norton, etc., instead of Windows Defender, temporarily disable it. Don’t forget to turn your firewall and antivirus back on when you’re done playing.

3. Update device drivers

If you don’t remember when you last updated your drivers, know that outdated drivers can be one of the causes of Apex Legends’ “Unknown File Version” error. We recommend immediately updating your most important drivers for trouble-free gaming, such as GPU, network drivers, sound card, mouse, etc. You can do it manually as follows:

1. Right-click on Windows Start and choose Device Manager.

Device Manager

2. Double-click on the driver category to expand.

Apex Legends Unknown File Version -  Update Sound Driver

3. Right-click on your hardware component and click Update driver.

4. Choose Search automatically for drivers and wait to complete the update.

The second way of updating all drivers is much simpler, faster, and more reliable than the manual way and requires the PC HelpSoft tool. This helpful tool will save you time and ensure that you always have all the drivers on your system up to date.

⇒ Get PC HelpSoft

4. Repair system files

If you still have an unknown file version error in Apex Legends, there is a possibility that some system DLL files are corrupted or missing. In that case, you can try to recover them using the Windows System File Checker (SFC) tool.

1. Type; cmd in the Windows search bar to find a Command Prompt app.

2. Right-click on the Command Prompt in the search result and select Run as administrator.


3. Type; sfc /scannow in the Command Prompt and press Enter.

Apex Legends Unknown File Version - SFC

4. Wait for SFC to scan your primary drive and recover any corrupted or missing files.

Apex Legends Unknown File Version - SFC result

5. Restart your PC and launch the game to check if the error is gone.

5. Reinstall Apex Legends

Still not solved the “Unknown File Version” error in Apex Legends? Then we recommend that you reinstall the game as a last resort. There may still be corrupted or deleted game files that you cannot fix without reinstalling. This way, you will have the game with all the necessary patches by the time you download it.

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That’s all we have prepared for you to successfully solve the “Unknown File Version” error in Apex Legends. Leave any suggestions or questions in the comments below.

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