The error 0x80240034 with Windows 10 is because Windows 10 Update cannot download the various files that it requires to perform the updates that Windows requires.

The error is specifically known as the "WU_E_DOWNLOAD_FAILED" error, which basically means that the system did not download the correct "Windows Update" files.

The resulting problem means that your system cannot manage the updates that are required to run, which causes the system to display erroneous behavior.

To solve the problem, you essentially need to solve any of the main problems that prevent Windows 10 Update from downloading the appropriate files; This comes in the form of having the ability to correct the tastes of the Windows 10 Update service, as well as being able to repair any of the underlying software applications that integrate with Windows.

The error message will usually be displayed as follows:

Error installing - 0x80240034

The causes of the error will generally be:

. Internet connection problems
. Microsoft Update server errors / problems
. Error with update payload itself
. Another miscellaneous error with the update (perhaps a third-party virus / software problem)

The way to solve the error is to make sure that the various files that Windows Update requires to function work correctly. This can be done using the following steps:
1. Run the Windows Update Troubleshooter

The first step is to run the Windows 10 Update troubleshooter.

This is a tool included with Windows 10 (and I think Windows 7) that allows you to clean up any of the problems that Windows may have with its underlying "update" processes.

To do this, you can follow the following steps:

. Press the "Windows" + "I" keys on your keyboard (load the "settings")
. Click on "Update and security"
. In the left pane, select "Troubleshoot"
. From the list that appears, select "Windows Update"
. Click on "Run this troubleshooter"
. Let the process run
. After completing, restart your PC

This probably won't fix the error, but it should solve most of the problems that are formed with the update service.

2. Run SFC + DISM

After doing the above, you must execute the SFC + DISM commands.

These are small command line-based applications within the Windows "10" system, designed to provide users with the ability to solve most of the problems that are formed with Windows.

You can do it using the steps described here:

. Press the Windows"10" + "S" key on your keyboard
. Type "CMD"
. In the first list that is displayed, right click and select "Run as administrator"
. In the black box that appears, type the following commands:
. "SFC / scannow" + press "Enter"
. "DISM / Online / CleanupImage / RestoreHealth" + press "Enter"

This will execute a series of "scans" that will basically ensure that your system can execute the various files / settings that you require correctly.

While this probably won't solve the problem (although it should do so in about 40% of cases), it should solve a lot of underlying problems that can lead you to show.

3. Manually restart the Windows"10" Update Service

Next, you must manually restart the Windows update service.

This is a bit complicated, but it should be the biggest contributor to a solution.

Basically, the way Windows Update works is with what is known as a "service."

This is an application that runs perpetually at the bottom of your system and allows other processes to use it at will.

The Windows update service is responsible for continuously downloading, resuming and updating the various elements necessary to perform updates in Windows.

Unfortunately, it is often the case that the system will end up having problems with the service, which can be resolved by manually restarting:

. Press the Window"10" + "S" key on your keyboard
. Type "CMD" and in the first item that appears, right click and select "Run as administrator"
. In the black boxX that appears, type the following commands:

. 'net stop wuauserv' + 'Enter'
. 'net stop cryptSvc' + 'Enter'
. 'net stop bits' + 'Enter'
. 'net stop msiserver' + 'Enter'
. 'Ren C: \ Windows \ SoftwareDistribution SoftwareDistribution.old' + 'Enter'

After doing this, you must restart the various services. This can be done through the following steps (again in the same CMD panel):

. 'net start wuauserv' + 'Enter'
. 'net start cryptSvc' + 'Enter'
. 'net start bits' + 'Enter'
. 'net start msiserver' + 'Enter'

This should be followed by running the windows update "Check for updates" command again

4. Temporarily disable the firewall / antivirus

Finally, one of the most common causes of the problem is a "false flag" of the likes of your antivirus or firewall application.

This happens because your system basically thinks that (for some reason) the Windows update service is causing irregular (potentially harmful) Internet connectivity and, therefore, will block it.

To solve this, you can follow the following steps:

. If you are using a THIRD PARTY antivirus
. Right click on the security software icon in the lower right corner of your Windows taskbar
. Select the equivalent of "pause" (can be "Game Mode" / "Temporarily Stop", etc.)
. Select "10 minutes" or the equivalent
. Try running Windows"10" Update again
. If WU does not work at this point, try step 3 again with your antivirus temporarily disabled
. Restart your system after this attempt

. If you are using Windows 10 Defender (default antivirus)
. Pres the "Windows 10" + "I" key on your keyboard
. Select "Update and security"
. In the menu on the left, select "Windows Security"
. Select "Virys(virus) and threat protections" and then "Virus and threat protections setting"
. Change "Real-time protection" to "Disabled"
. Try to update the system and, if it doesn't work, try step 3 again
. After this, re enable the Window Defenders service, restart your PC
--
If the above does not work, you will probably have deeper problems with your system. Obviously, a generic Internet article is not going to solve that.

To solve this, it will be better to talk to someone with specific experience / practice with your system. This can be achieved either by going to an online community (SuperUser, etc.) or by talking with someone who professionally fixes the system. Fiverr has become a decent source of this type of service. In any case, the problem should be relatively simple to solve: the difference lies in trying to identify the central problem that leads you to show.