How to fix Can’t Update World of Warcraft BLZBNTAGT00000840 Error

Several Users have claimed that whenever they try to update World of Warcraft they get stuck with the below mention error message:

Something went wrong with the file. We’re not sure what caused it, so please try again or click the code below for more information. Sorry about that! More help: BLZBNTAGT00000840

Well it is one of the most frequently reported errors on forums nowadays. Once the users get prompted with this error they cannot update their game to the latest version. Though the error can be easily tackled with some tried and tested methods. But the consequences of the error are quite irritating because when the user fails to update to the latest version. The outdated version of the game conflicts with the server and create other troubles for the users while playing the game.

While going through several forum sites we concluded that there are so many reasons that are responsible for prompting this error on the users screen. We have enlisted all the potential culprits you can check them one by one.

Reason 1: Corrupted Game Data

Reason 2: Outdated OS and Outdated PC Drivers

Reason 3: Interference of Windows Defender Firewall

Reason 4: Essential Permissions are missing

Reason 5: Corrupted data in the game installation folder

Reason 6: Battle.net lacks admin access

Reason 7: If your system does not meet the System Requirements

Try these fixes for Can’t Update World of Warcraft BLZBNTAGT00000840 Error

Method 1: Check the System Requirements

You are likely to face the above mention error if your system does not meet the minimum requirements for playing the game.

Minimum Requirements

VIDEO CARD: NVIDIA GeForce GTX 560 2GB or AMD Radeon HD 7850 2GB or Intel HD Graphics 530 (45W)

PIXEL SHADER: 5.0

VERTEX SHADER: 5.0

FREE DISK SPACE: 70 GB

DEDICATED VIDEO RAM: 2 GB

CPU: Intel Core i5-760 or AMD FX-8100 or later

CPU SPEED: Info

RAM: 4 GB RAM (8GB for integrated graphics such as Intel HD Graphics)

OS: Windows 7 / Windows 8 / Windows 10 64 bit

Recommended Requirements

VIDEO CARD: NVIDIA GeForce GTX 960 or AMD Radeon R9 280 or later

PIXEL SHADER: 5.1

VERTEX SHADER: 5.1

FREE DISK SPACE: 70 GB

DEDICATED VIDEO RAM: 4 GB

CPU: Intel Core i7-4770 or AMD FX-8310 or later

CPU SPEED: Info

RAM: 8 GB

OS: Windows 10 64 bit

Method 2: Reboot your PC

In this method we suggest you to reboot your system. Restarting the System will remove the system glitches and refresh your OS. So kindly restart your PC.

Method 3: Disable or Uninstall 3rd party Security Programs

Note: This method is only applicable for games using 3rd party suites- if you use Windows Security as your default antivirus, skip this method altogether.

And if you use an average antivirus suite without a firewall component, it should be enough to disable the real-time protection.

Follow the below mention steps to uninstall 3rd party AV suite that includes firewall component:

Step 1:  First of all press Win + R keys to open up Run dialog box, then type in ‘appwiz.cpl’ and press Enter key to open Program and features menu

Step 2: When you are in the Programs and Features menu, scroll down through the list of installed programs and locate security suite that you wish to uninstall

Step 3: Once you find it, right click on it and choose Uninstall from the context menu to start the un-installation process.

Once done then reboot you PC and check if the issue resolved or not.

Method 4: Disable the Proxy Server

In this method it is recommended to disable the proxy server and to do so follow the below mention instructions:

Step 1: Press Windows + R keys to open Run dialog box. Then type in ‘ms-settings:network-proxy’ and press Enter to open up Proxy tab from the native Windows 10 menu.

Step 2: When you are in the proxy tab, scroll down to Manual Proxy Setup and disable the toggle related with Use a proxy server.

Step 3: Once done then reboot your system and try to install the World of Warcraft update.

Method 5: Delete WOW Cache Folder

If you are still struggling with Can’t Update World of Warcraft BLZBNTAGT00000840 Error then try to delete the WOW cache folder. To do so follow the below mention instructions:

Step 1: Go to World of Warcraft folder>then right-click on Cache folder and select the Delete option

Method 6: Disable Read-Only Attribute

Several users have claimed that disabling Read-Only Attribute worked for them so you can also give a chance to this method.

Here’s how:

Step 1: First of all launch File Explorer and go to World of Warcraft folder>then right-click on Wow.exe setup file and select Properties option

Step 2: After that Switch to the General tab and then uncheck the box next to Read-Only next to Attributes section

Step 3: Lastly click on Apply>OK to save the changes

Method 7: Run Blizzard Battle.net as an Administrator

You are likely to face the above mentioned error if you are not running the game as an administrator. So follow the below mention guidelines to run Blizzard Battle.net as an Administrator:

Step 1: First of all right-click on the World of Warcraft shortcut on the desktop or go to the installation directory and right-click on it

Step 2: Select the Properties option> then switch to the Compatibility tab & check the box Run this Program as an Administrator

Step 3: Lastly tap on Apply>OK to save the changes

Method 8: Rename Cache, Interface and WTF Folders

Well Cache, Interface and WTF are responsible for storing the basic information on the game, progress and settings. And if they get corrupted due to any reason then you are likely to face the above mention error.

So in such case you need to rename the folders by following the below mention guidelines:

Step 1: First of all close all the processes running in the background and press Win + R keys together to open the File Explorer> then go to the following path:

C:\Program Files (x86)\World of Warcraft

Step 2: After that find the following folders and right-click on them and select Rename:

Cache

Interface

WTF

Step 3: Now rename the folders to something like Cacheold, Interfaceold, WTFold

Once done then relaunch the game and see if the issue gets resolve or not.

Method 9: Run Blizzard Repair Tool

You are likely to face the above mention error if you have damaged/corrupted files. So we suggest you to run the Battle.net Repair Tool by following the below mention guidelines:

Step 1: Navigate to the directory of the Wow.exe setup file & select Run as an Administrator option

Step 2: Then click on Yes to proceed if you are prompted by User Account Control Window>then switch to the Games tab at the top of the corner of the window & then select World of Warcraft from the list

Step 3: Click on the options followed by Scan & Repair from the drop down list then in the next step, click on Begin Scan & wait until the process gets completed.

Lastly Restart your game and see if the issue resolved or not.

Method 10: Reinstall World of Warcraft

If none of the above mentioned method works for you then we suggest you to uninstall and then reinstall World of Warcraft.

Here’s how:

Step 1: Press Windows keys and type apps & features and click on Open>then search World of Warcraft in the list and click on it. After that select Uninstall option

Step 2: If you are prompted again click on Uninstall>then visit the Blizzard Official Site, and click on World of Warcraft

Step 3: Click on Downloads for Windows option & wait until the game gets installed on your PC>then go to My downloads in File Explorer & double-click on the setup file to run my application.

Step 4: Lastly follow the on-screen instructions to install the game on your system.

That’s all guys, we hope that this blog was helpful for you and you liked it.

Sakshi Anant Author

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