Fix League of Legends Unknown Error on Windows 10

League of Legends, better known as LoL, is a popular online game released in 2009 by Riot Games. At the time of release, the game was only supported on Mac and Windows operating systems. However, LoL has become expansive compared to many other platforms due to its exclusive fan base. It also has an infamous history of bugs and problems. One such problem is the League of Legends unfixed bug. Update failure is a common cause that causes unexpected LoL error. So, if you are also annoyed by this error message, this guide will help you deal with this unspecified League of Legends error. So keep reading!

How to fix League of Legends uninstalled error on Windows 10

Here is the full version of this unspecified League error:

An unknown error has occurred. Please check the logs for more information

There are many reasons for this problem. Some of them are listed below.

  • League of Legends does not have admin rights.
  • Network connection problems.
  • DNS address conflicts.
  • The antivirus package interferes with the same.
  • Windows Defender Firewall is blocking the program.
  • Problems in the hosts file.
  • DirectX blocks LoL.
  • Misconfigured files in an installed game.

Now move on to the next section to learn about the troubleshooting methods to resolve the issue.

To resolve this unexpected LoL error on Windows 10, follow the methods below.

Basic Troubleshooting Steps

Before moving on to advanced troubleshooting methods, try these basic tips to quickly resolve the issue.

1. The general way to resolve all League of Legends related temporary glitches is to restart your computer.

2. Some users have reported that an unstable internet connection also leads to this error. You can run a speed test to find out the optimal network speed level required for a proper connection.

3. You can restart your router by following our guide to restarting your router or modem. After restarting your router, check if you can fix this error.

4. If there are too many background processes on your Windows 10 PC, you won't be able to access the network connection easily as all these tasks will take up network share. Follow our guide on how to end a task in Windows 10 to close all other background processes on your Windows 10 PC.

Method 1: Start League of Legends manually

If your PC takes extra time to fix League of Legends, you will encounter a League of Legends unspecified error. However, you can manually fix the game by following the steps below.

1. Press the Windows + E keys at the same time to open File Explorer.

2.Now navigate to the following location path:

C:Riot GamesLeague of LegendsRADSprojectslolpatcherreleasesdeploy

3. In the Deploy folder, right-click the LoLPatcher.exe executable and select Run as administrator.

Method 2: Run League of Legends as an administrator

To avoid League of Legends Undefined Error on your Windows 10 PC, run League of Legends as an administrator as given below:

1. Right-click the League of Legends shortcut on your desktop.

2. Now select the Properties option.

3. Then go to the "Compatibility" tab and check "Run this program as an administrator".

4. Finally, click Apply > OK to save the changes.

Method 3: Delete the LoL_air_client folder (if applicable)

Another easy way to fix LoL unexpected error is to delete a specific folder in File Explorer. This removes the corrupted components in your Windows 10 related to the game. Here are a few steps to delete a folder.

1. Launch File Explorer by pressing the Windows + E keys at the same time.

2. Now go to the next location and open it.

C:Riot GamesLeague of LegendsRADSprojectslol_air_client

Note. You can also find the lol_air_client folder elsewhere. Pay a little more attention to finding the folder.

3. Right-click on the lol_air_client folder and select the Delete option.

4. After deleting the folder, restart your computer.

Method 4: Set up the hosts file

If League of Legends entries have been edited in the hosts file, you will encounter this unspecified error. Therefore, you must change the entries in the file to resolve this issue. Here are some instructions for setting up hosts entries.

1. Launch File Explorer.

2. Click the View tab and check the Hidden Items box in the Show/Hide section.

3. Now navigate to the following path in File Explorer:


4. Right-click on the hosts file and select the "Open With" option as shown in the figure.

5. Now select Notepad and click OK as shown in the picture.

6. Now add this line to the end of the file.

7. Now save the file by simultaneously pressing the Ctrl+S keys.

8. Close Notepad and check if you have fixed the unspecified League of Legends error.

Method 5: Change the game update client

This method is quite complicated and requires attention. However, you can deal with them wisely by following the steps below.

1. Open File Explorer as above and navigate to the specified path.

C:Riot GamesLeague of Legends

2. Now locate and right click the User.cfg file.

3. Then select the option "Open With" > "Notepad" as shown in the picture.

4. Now press the Ctrl + F keys at the same time to open the search box. Here, enter LeagueClientOptIn in the Find tab.

5. Change the LeagueClientOptIn value from Yes to No.

6. Press the Ctrl + S keys at the same time to save the changes and restart the game.

Method 6: Customize the system.cfg file

Likewise, tweaking the system.cfg file in the League of Legends folder will help you fix this unexpected LoL error on Windows 10. Follow the steps below to implement the same.

1. Open File Explorer and navigate to the following path.

C:Riot GamesLeague of LegendsRADS

2. Now locate the system.cfg file and right click it.

3. Then select Open With and then Notepad.

4. Press the Ctrl + A keys together to select the content and press the Delete key.

5. Now paste the following line and save the changes by pressing the Ctrl + S keys.

DownloadPath = /releases/live DownloadURL = Region = EUW

Method 7: Update Windows

Windows updates can fix all the bugs and erroneous fixes on your computer. Microsoft releases frequent updates to fix all these issues. Therefore, make sure you are running an updated version of the Windows operating system, and if any updates are pending, use our guide How to download and install the latest Windows 10 update.

After updating your Windows operating system, check if you have fixed the unspecified League of Legends error.

Method 8: Update GPU drivers

If you want to enjoy any graphical games without any bugs, your drivers must be in perfect condition. Be sure to update them if they are faulty or outdated. You can update them by searching for the latest driver releases on the official websites, or by manually updating them. Follow our guide on 4 Ways to Update Graphics Drivers in Windows 10 to update the driver and check if LoL Unexpected Error still persists or not.

Method 9: Roll Back GPU Drivers

Sometimes the current version of your graphics drivers can cause startup conflicts. In this case, you need to restore the previous versions of the installed drivers. This is called a rollback. You can easily roll back your graphics drivers to their previous state by following the steps in our How to Roll Back Drivers in Windows 10 guide.

Method 10: Reinstall GPU Drivers

If you are still encountering an unexpected LoL error after updating your GPU drivers, please reinstall your device drivers. You can reinstall drivers on your computer in several ways. However, you can easily reinstall your graphics drivers by following the instructions in our How to Uninstall and Reinstall Drivers in Windows 10 guide.

After reinstalling your GPU drivers, check if you can access League of Legends without errors.

Method 11: Change DNS Address

Several users have suggested that switching to Google DNS addresses might help you fix this unspecified error lol. If you launch Minecraft correctly and see a black blank screen, follow our guide to change the DNS address. This will help you resolve all DNS (Domain Name System) issues so that you can run the game without any problems.

After changing your DNS address, check if you can run LoL without the error screen.

Method 12: Temporarily disable your antivirus (if applicable)

Another possible reason that causes League of Legends uninstalled error is your security package. When your antivirus software detects Minecraft files and folders as a threat, you will encounter several conflicts. So, read our guide How to Temporarily Disable Your Antivirus on Windows 10 and follow the instructions to temporarily disable your antivirus program on your PC.

After fixing the discussed issue with Minecraft on Windows 10 PC, be sure to re-enable your antivirus program as a system without a security pack is always a threat.

Method 13: Disable Windows Defender Firewall (Not recommended)

In addition to your antivirus program, Windows Defender Firewall can prevent you from accessing games on your PC. So, try disabling Windows Defender Firewall as mentioned in our How To Disable Windows 10 Firewall guide and follow the steps accordingly.

Note. After starting LoL after disabling the Windows Defender Firewall, make sure you re-enable the firewall package after playing. A computer without a security package is always susceptible to malware attacks.

Method 14Use a VPN

However, if you can't solve your problem, you can try using a virtual private network. This provides a more private and encrypted connection. You can change the geographic region using the VPN settings to fix this error easily. Even though there are so many free VPNs available on the internet, you are advised to use a reliable VPN service to enjoy the premium versions and features. If you don't know how to set up a VPN on a Windows 10 computer, follow our How To Set Up a VPN on Windows 10 guide and implement it.

Method 15: Adjust registry keys

Several gamers have confirmed that reinstalling DirectX on your PC helped them fix this unspecified error LOL. Here is how to remove the installed DirectX file from the registry.

1. Press the Windows + R keys at the same time to open the Run dialog box.

2. Now type regedit and press the Enter key to open the Registry Editor.

3. Click "Yes" in the User Account Control window.

4. Navigate to the following path in the registry editor:


5. Now right-click on the InstalledVersion file and select the Delete option.

6. Remove the version file in the same way as before.

7. Now follow our guide to download and install DirectX on Windows 10 to reinstall DirectX on your Windows 10 PC.

Method 16: Reinstall League of Legends

Any misconfigured files in League of Legends will result in an unexpected LoL error even if you have followed all the above methods and updated all pending actions. So in this case, you have no other choice but to reinstall the game. The game is tied to your account and you won't lose your progress when you reinstall the game. Here's how to reinstall League of Legends:

1. Press Windows Key + I to open Settings.

2. Select application settings.

3. Scroll down and click League of Legends. Then select Delete.

4. Click "Delete" again in the pop-up window.

5. Now click Done.

6. Press the Windows key, type %appdata% and click Open.

7. Double click Riot Games to open the folder.

8. Now right click on the Install League of Legends euw folder and delete it.

9. Press the Windows key, type %localappdata% and click Open.

10. Delete the League of Legends folder as you did before.

11. Now, restart your computer .

12. Then visit the official League of Legends download page and click the "PLAY FOR FREE" button.

13. Enter your email address and press START.

14. Select your date of birth in the next step and click NEXT.

15. Now fill in the USERNAME, PASSWORD and CONFIRM PASSWORD fields.

16. Check the box I agree to the Terms of Service and I have read and accept the Privacy Notice.

17. Then click NEXT.

18. Now click the DOWNLOAD FOR WINDOWS button.

19. Click on the downloaded installation file to install and run the game.

20. Click the "Install" button at the prompt.


We hope this guide was helpful and you were able to fix the League of Legends unspecified error on Windows 10. Let us know which method worked best for you. Also, if you have any questions/suggestions regarding this article, feel free to post them in the comments section. Also, let us know what you would like to know next.

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