A lot of Globe of Warcraft players are lament that they can no longer update their World of Warcraft installation on PC. Every update that they attempt installing fails with the same error – Something went wrong with the file (BLZBNTAGT00000840).

Can't update World of Warcraft

Every bit it turns out, this item issue has a wide array of potential culprits that might be ultimately responsible. To brand things easier for you, nosotros made a list of scenarios that are most likely contributing to the World of Warcraft problem you're currently dealing with:

  • Ongoing Blizzard server issue/maintenance menses – There's a chance Blizzard is currently patching or undergoing maintenance for the World of Warcraft servers in your region. Because of this, the platonic way to starting time this troubleshooting task is by checking if other players in your surface area are currently dealing with the aforementioned affair. Check the official Blizzard Twitter account and investigate directories like DownDetector to get a bird's heart view of the state of affairs.
  • Boxing.Internet is defective admin admission – Another reason why you might wait to deal with this issue when attempting to update your World of Warcraft version is a scenario in which the game launcher (Battle.net) doesn't have admin rights to replace the current game files with new equivalents. If this scenario is applicable, you will exist able to fix the event past forcing admin rights on the game launcher.
  • Glitched service running in the background – As it turns out, some other fairly mutual occurrence that might crusade this problem is a glitched Battle.internet or WoW service that is running in the background. In this case, a uncomplicated restart should exercise the trick.
  • AV interference – Every bit some afflicted players have reported, there are several different overprotective Antivirus suites that have the potential of blocking the update due to a fake positive. If y'all find yourself in this scenario, you tin can try temporarily disabling the real-time protection or uninstall the suite completely if the issue persists.
  • Addon Manager interference – Simply similar AV suites, there'southward an unabridged category of addon managers that are known to foreclose the main Agent from updating game files belonging to Earth of Warcraft. The merely way to deal with this type of issue is to temporarily uninstall or disable these programs.
  • Game file corruption – Game abuse can likewise be responsible for preventing new WOW updates from installing (in case Amanuensis is afflicted past corruption). In this case, y'all should get-go by running the repair tool and work your fashion towards reinstalling the game + Battle.net if the issue persists.
  • Proxy or VPN interference – As it turns out, Blizzard will actively cake download attempts that are being filtered through a Proxy or VPN connection. So if you currently used the services of a Proxy server or VPN to remain anonymous, you'll need to disable these services before you'll be able to complete the update.
  • Secondary logon service is Disabled – The updating function of Battle.net needs a very important dependency service to repair enabled at all times (Secondary Logon Service). If you previously modified the default behavior of this service, you tin can probably get the issue fixed by accessing the Services screen and configuring this service properly.
  • Interference caused by WOW Voice proxy – WowVoiceProxy is the established vocalism chat functionality for Earth of Warcraft. Nevertheless, it'southward still glitchy (especially on Windows 11) and known to conflict with the download agent. You tin brand sure it's not affecting the download office by force stopping it via Job Manager.
  • Conflict with Overwatch's CrashMailer – If you have both Overwatch and World of Warcraft installed, yous might want to access your Overwatch binder and get rid of the 64-bit file called CrashMailer. This will not bear on the functionality of the game and will ensure that there'south no conflict between the ii games.
  • Conflict with Anarchism Vanguard – If you have the anti-cheat engine from Riot installed (Anarchism Vanguard), you should accept the time to uninstall it temporarily and endeavour to update WOW while the engine is uninstalled. We found some reports confirming a disharmonize betwixt Riot Vanguard and the download Agent of Earth of Warcraft.

1. Bank check for an ongoing server consequence

When you start troubleshooting this item issue, you should start past ensuring that the issue is not beyond your control.

Information technology'south not uncommon for users to feel the BLZBNTAGT00000840 while the game client is in the middle of scheduled maintenance or when Blizzard engineers are busy patching a server issue in your region.

Because of this, it's important to take the time and investigate if other users in your area are currently experiencing problems with Boxing.net and World of Warcraft.

You lot can do then past checking the DownDetector listings of the two:

  • Word of Warcraft page on DownDetector
  • Battle.Internet page on DownDetector

Note: If the investigation has revealed that other users in your area are besides experiencing this type of outcome, chances are the issue is indeed across your control.

To be certain, you can also check the official Twitter back up page of Blizzard for an official announcement related to the outage or scheduled maintenance period.

On the other hand, if this investigation didn't let you to conclude that you're dealing with a server upshot, move down to the next potential fix beneath.

ii. Reboot your PC

If you used the method in a higher place to brand sure that you're non dealing with an underlying server issue affecting World of Warcraft, the adjacent thing you should do is troubleshoot against a potential glitches service that should be running in the background to facilitate the download of the update files.

The quickest manner to ensure that no glitched service dependency is running in the background is to simply reboot your PC and initiate the download immediately subsequently the next startup is complete.

In case the aforementioned Something went wrong with the file (BLZBNTAGT00000840) is still occurring even later on you rebooted your PC, motility down to the next potential prepare below.

3. Grant admin access to Battle.Net

Now that you ruled out a potential glitched service from the list of culprits, the adjacent thing you should do is ensure that the master game launcher (Boxing.Net) has the authoritative privileges to replace existing game files with new equivalents – to do this, it needs admin admission.

By default, Boxing.net will exist granted admin rights as yous are being prompted by the UAC (User Account Control) window when you open up upwards the launcher. Simply this might non happen if you use more aggressive UAC settings on Windows 10 or Windows 11.

You can ensure that admin access is granted to Battle.Internet by right-clicking on the main executable and clicking on Run equally Administrator from the context menu.

Running as ambassador

Note: At the UAC (User Account Control), click Yes to grant admin admission.

In one case Boxing.net is open with admin admission, attempt to install the World of Warcraft update once again and see if the operation is complete.

If the update now completes successfully, you tin ensure that Battle.Net will ever open with admin access by modifying the default beliefs of the shortcut that you utilize.

Follow the instructions below to force admin access on the Battle.net shortcut:

  1. Correct-click on the Battle.Net shortcut and cull Properties from the context menu that only appeared.
    Admission the Properties screen
  2. Once you're inside the Properties screen, access the Compatibility tab from the menu at the top.
  3. From the Compatibility tab, scroll down to the Settings carte du jour and cheque the box associated with Run this program equally an ambassador.
    Run this program as ambassador
  4. Hit Apply to striking the changes and that'south it. Battle.Net is at present configured to always open with admin access.

If the problem is still not stock-still, motion downwardly to the side by side potential fix below.

iv. Disable or Uninstall 3rd party Security Programs (if applicable)

As it turns out, another potential cause that might really cause this trouble is an overprotective antivirus suite that is blocking the data transfer between the WOW download agent and the Blizzard server due to a false positive.

Several users that were also dealing with this problem have confirmed that the problem was finally resolved later on they either disabled or uninstalled the interfering 3rd party suite.

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

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

Disable the tertiary party antivirus

Note: You can typically practise this by accessing the tray bar icon of your antivirus.

However, if you lot're using a tertiary party AV that includes a firewall component, the merely viable action that fixes the issue is to uninstall the suite temporarily. This is necessary because the aforementioned security rules will remain in place fifty-fifty after you disable the real-time protection.

Follow the instructions below to uninstall a tertiary party AV suite that includes a firewall component:

  1. Printing Windows key + R to open upwardly a Run dialog box. Adjacent, type 'appwiz.cpl' and press Enter to open up up the Programs and Features menu.
    Open the Programs and Features bill of fare
  2. Once you're within the Programs and Features carte, roll down through the list of installed programs and locate the security suite that you wish to uninstall.
  3. Once you find it, right-click on information technology and cull Uninstall from the context carte du jour to initiate the uninstallation process.
    Uninstall problematic antivirus
  4. Once the problematic antivirus has been uninstalled, reboot your PC and encounter if the BLZBNTAGT00000840 is now stock-still.

If the aforementioned kind of effect is notwithstanding occurring, motility down to the next potential prepare beneath.

5. Disable or Uninstall Add-on Managers (if applicable)

Go along in mind that the community around Globe of Warcraft has developed a lot of unlike Addon managers that arrive easier to install community-created mods on the vanilla versions of WOW.

However, information technology's important to understand that the bulk of these add-on managers volition actually prevent the main Blizzard amanuensis from installing the latest available updates available for World of Warcraft.

So if you are looking to play the game as the original developers intended (on official servers and with the latest updates installed), chances are you'll only be able to practice and then afterward disabling or uninstalling the add-on manager that you currently have installed.

In some cases, you might be able to allow the update to go through without the BLZBNTAGT00000840 error but by ensuring that the main process behind the WOW addon director is closed and not running in the background.

You can do this by opening Task Director (Ctrl + Shift + Enter) and catastrophe the process related to the addon managing director from the Processes tab.

Ending the Addon manager task

If this doesn't piece of work and the aforementioned bug persist, the remaining option is to temporarily uninstall your add-on director. Here's how to do this:

  1. Press Windows key + R to open up up a Run dialog box. Next, type 'appwiz.cpl' within the text box and press Enter to open the Programs and Features screen (Windows 10 and older) or the Installed apps screen (Windows 11).
    Open up the Installed apps screen
  2. Once you're inside the Installed apps or Programs and Features screen, search for your WOW addon manager using the search function at the superlative.
    Search for WOW addon managers
  3. Next, click on the action icon associated with the WOW addon manager that you wish to remove and click on Uninstall from the context menu.
  4. At the confirmation prompt, click on Uninstall once again, then proceed with the uninstallation of the remaining items.
  5. After the WOW addon manager is finally uninstalled, reboot your PC, so launch Battle.cyberspace once the side by side startup is complete and run across if the problem is now fixed.

In case your attempts at updating World of Warcraft end with the aforementioned "Something went wrong with the file (BLZBNTAGT00000840)" error, move down to the next potential fix.

vi. Run the repair tool

If none of the methods above have proven to be effective in your case, the next thing you lot should investigate is a potential issue brought near past some corrupted game files or game dependencies.

This is peculiarly likely if yous have previously attempted to modify or replace sure game files belonging to World of Warcraft.

You lot tin can wait to see the BLZBNTAGT00000840 in case the Battle.internet update agent detects that the game installation folder contains file corruption. In this case, the solution is simple – yous'll demand to repair the current World of Warcraft installation using the scan & repair functionality available inside Battle.net.

Follow the instructions below for specific instructions on how to do this:

  1. Make sure that World of Warcraft is closed and not running in the groundwork.
  2. Open Boxing.cyberspace with admin access (right-click on the executable and choose Run as Administrator).
    Running as administrator
  3. Next, select Earth of Warcraft from the library section of Battle.Cyberspace.
  4. With the game selected, click on the Settings (gear icon), and so click on Scan & Repair from the context menu that just appeared.
    Browse and Repair Globe of Warcraft
  5. At the side by side confirmation prompt, click on Begin Scan to beginning the operation.
  6. Look until the operation is consummate, and then attempt to install the pending update for Earth of Warcraft and see if the trouble is now fixed.

In case the same problem is still occurring, movement down to the next potential fix below.

7. Disable Proxy or VPN connections

Keep in listen that the update agent that Blizzard uses for their Battle.net launcher is notoriously known for existence extremely picky when it comes to assuasive updates to come through a connection funneled through a VPN or Proxy network.

And so if y'all are currently using a proxy or VPN connection, you lot would probable be forced to temporarily disable them (or fifty-fifty uninstall them) in society to be able to install the awaiting update.

Depending on the technology that you're using, you'll either need to disable the anonymity solution or uninstall it from your PC.

To assistance you with both potential scenarios, we've put together two dissever guides that will guide you lot through this:

Disable the proxy server

If you lot're on Windows 10 or Windows xi and y'all're using the native Proxy connectivity feature, this tin can exist done direct from the Proxy tab of the Settings bill of fare.

Here's what y'all demand to exercise to disable the proxy server:

  1. Open up a Run dialog box past pressing Windows key + R. Next, type 'ms-settings:network-proxy' and press Enter to open up up the Proxy tab from the native Windows 10 menu.
    Open the Proxy server
  2. Once you are inside the Proxy tab, roll down to theTransmission proxy setupand disable the toggle associated withUse a proxy server.
    Disable the use of a proxy server
  3. Equally soon as the proxy solution has been disabled, you can safely reboot your PC and endeavor to install the pending World of Warcraft update in one case once more.

Disable or uninstall the VPN customer

In instance you lot are currently using a arrangement-level VPN deployed directly using the native functionality (present on Windows x and Windows 11), you can revert the settings past visiting the VPN tab of the Settings menu.

Here's how:

  1. Printing Windows key + R to open up a Run dialog box. Side by side, type 'ms-settings:network-vpn' inside the text box and printing Enter to open up the VPN tab of the Settings app.
    Opening up the VPN tab
  2. In one case you're finally inside the VPN tab, move over to the right-hand department of the screen, then click on the VPN network that you currently take set.
    Disabling the VPN client
  3. Adjacent, click on Disconnect from the context carte du jour that simply appeared.
  4. At the final confirmation prompt, click Yes and wait for the VPN connectedness to be terminated.
  5. Finally, open Boxing.net once more and endeavor to install the pending update that was previously failing.

If this problem is still not fixed, move downward to the next potential fix below.

eight. Enabling the Secondary Logon service

A key dependency that is often disregarded past players engaging with Blizzard games is the Secondary Logon service.

Annotation: Secondary Logon is a process that enables processes under alternate credentials. It's heavily used past Battle.Net and every game released on the platform.

This service should be enabled by default unless you lot alter its default beliefs. If yous've configured it to remain disabled, chances are that'due south the reason why you are getting the BLZBNTAGT00000840 error while attempting to install the pending update.

Follow the instructions beneath to ensure that the Secondary Logon service is enabled and properly configured via the Services screen:

  1. Press Windows key + R to open up a Run dialog box. Next, type 'services.msc' within the text box and press Enter to open upward the Services screen.
    Open up the services screen
  2. Once yous're within the Services screen, scroll downwardly through the listing of services and locate the Secondary Logon service.
  3. One time you see it, right-click on it and click on Properties from the context menu that just appeared.
    Accessing the Properties screen
  4. Once you're inside the Properties screen of Secondary Logon, admission the Full general tab, and then change the Startup type from Disabled to Automatic.
    Setting the Startup blazon to Automatic
  5. Finally, click on Utilize to relieve the changes, then reboot your PC and run into if yous tin now install the awaiting Globe of Warcraft patch without experiencing the aforementioned fault.

If the trouble is nonetheless not resolved or this method was non applicable, motility down to the next potential fix below.

nine. Disable the World of Warcraft Vocalisation Proxy in Chore Manager

If you're looking for a quick set up that a lot of affected World of Warcraft players have successfully used to become around this consequence, you should also attempt disabling the WOW Vocalism Proxy service via Job Director.

Note: WowVoiceProxy has been the backbone for the vocalisation chat functionality inside World of Warcraft since 2018.

Although this service is completely harmless and should be kept enabled, increasingly more WOW players are blaming it for blocking new game updates carried over by the Blizzard update agent.

Fortunately, at that place's one workaround available in this case – opening Task Manager and strength-endmost the WOWVoiceProxy service before initiating the download inside Battle.net.

Hither are the consummate step-by-step instructions on how to practice this:

  1. Press Ctrl + Shift + Enter to open up Task Manager.
    Showing more details in Task Director

    Note: If the uncomplicated interface opens by default, click on More Details to go the expert interface.

  2. One time you lot're inside the practiced interface of Task Managing director, select the Processes tab and gyre down to the Groundwork Processes.
    Accessing the Background processes
  3. Nether BackgroundProcesses, scroll down through the list and locate the WOWVoiceProxy server. When you see it, right-click on information technology and choose End Job from the context carte.
  4. Later you've done the step above, return to Battle.cyberspace and attempt to install the pending update for World of Warcraft once once again.

If the attempt fails with the same BLZBNTAGT00000840 error, move downwards to the next potential prepare below.

10. Delete CrashMailer from Overwatch folder

If you besides accept Overwatch installed on the PC that is currently exhibiting the BLZBNTAGT00000840 error, some other scenario that yous should investigate is a potential conflict with Overwatch's 64-bit version of the Crashmailer (CrashMailer_64.exe) file.

Note: CrashMailer_64.exe is a non-essential process that belongs to Overwatch. It's a reporting tool that'due south used to compile error logs when the game crashes unexpectedly. It's in no mode essential to the game and tin be deleted – the Boxing.net launcher will regenerate the file the next time y'all launch overwatch.

Several affected users have discovered that by deleting the CrashMailer file, the conflict is temporarily resolved and the pending Earth of Warcraft update can finally be installed.

Keep in mind that even if you finish up deleting the CrashMailer_64.exe file, Boxing.internet volition just regenerate it once once more the next fourth dimension you launch overwatch.

And so if you lot want to deploy this ready, follow the instructions below for specific instructions on how to practise this:

  1. Open File Explorer, and then admission the post-obit location to observe the CrashMailer_64 file:
     C:\ Programme Files (x86)\ Overwatch \ ErrorReporting \ x64
  2. Once you're inside the correct location, locate the CrashMailer_64 file, and then right-click on information technology and choose Delete from the context menu.
    Deleting the CrashMailer_64 file
  3. Once the file is successfully deleted, open Battle.net once more and endeavor to install the awaiting update for World of Warcraft.

If the same kind of error is still occurring, move down to the adjacent potential prepare beneath.

11. Uninstall Riot Vanguard (if applicable)

If you've come this far without a feasible solution, one last thing that you lot can try is to temporarily uninstall the Riot Vanguard installation.

Note: Riot Vanguard is a custom anti-crook system that'due south designed to forestall gamers from cheating and upholding the latest industry-standard when it comes to competitive gaming. It'due south primarily used for League of Legends and Valorant.

If you have Valorant or League of Legends installed, there's a very big take a chance you have Anarchism Vanguard installed too (since information technology'southward arranged with both of these games).

While this anti-cheat engine is great and we would encourage anyone to utilize it as intended, there are a lot of users blaming information technology for blocking certain updates coming through Battle.net (including pending WOW updates).

Several users that we're also dealing with this problem have confirmed that the WoW BLZBNTAGT00000840 error was finally resolved and the update went through after they temporarily uninstalled Riot Vanguard.

Hither's how to uninstall Riot Vanguard from your PC (and reinstall it again):

  1. Press Windows central + R to open up a Run dialog box. Side by side, type 'appwiz.cpl' and press Enter to open up the Programs and Features (Windows 10 and older) menu or Installed apps menu (on Windows 11).
    Open up the Programs and Features menu
  2. One time you lot're inside the Programs and Features or Installed apps card, utilise the bachelor search function to find 'riot vanguard'.
  3. Next, from the list of installed apps, click on the Uninstall push associated with Riot Vanguard.
    Uninstall Riot Vanguard
  4. Follow the remaining prompts to consummate the uninstallation process.
  5.  Open Battle.internet once more and install the pending update once again to encounter if the problem is now fixed.