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# 0x80240034 WU_E_DOWNLOAD_FAILED: Fix Windows Update Download Error

> Fix Windows Update error 0x80240034 (WU_E_DOWNLOAD_FAILED) in Windows 10 and 11 with easy steps: free up space, reset update cache, and install updates manually.

Windows Update error **0x80240034** (`WU_E_DOWNLOAD_FAILED`) means an update started downloading but could not finish. You usually see it when an update gets stuck at a percentage like 0% or 99% and then fails. The cause is usually a damaged update cache, low disk space, or a stopped update service. This guide explains why it happens and walks you through the fixes, from the quickest to the most thorough.

<Info>
  **Quick answer:** Free up at least 20 GB of disk space, reset the Windows Update cache (Fix 4), restart your PC, and check for updates again. If it still fails, download the update manually from the Microsoft Update Catalog (Fix 7).
</Info>

## What does error 0x80240034 mean?

The code **0x80240034** stands for `WU_E_DOWNLOAD_FAILED`, which simply means **"Update failed to download."** Windows Update reached Microsoft's servers, but the downloaded files were incomplete, damaged, or could not be saved.

You may see messages like:

* `There were problems installing some updates... Download error - 0x80240034`
* `2026-xx Cumulative Update for Windows 11... Download error - 0x80240034`
* An update stuck at **Downloading - 0%** or **99%** before failing

## Common causes

* **Corrupted update cache** in the `SoftwareDistribution` folder
* **Not enough free disk space** for the update
* **Windows Update or BITS service** stopped or stuck
* **Metered connection** settings blocking downloads
* **Damaged system files**
* An unstable internet connection, VPN, or antivirus interfering with the download

## How to fix error 0x80240034

Try the fixes in order. Restart your PC after each one and check Windows Update again.

### Fix 1: Restart your PC and retry the update

A simple restart clears stuck downloads and restarts the update services.

1. Restart your PC (do not just shut down).
2. Go to **Settings > Windows Update**.
3. Select **Check for updates** or **Retry**.

### Fix 2: Run the Windows Update troubleshooter

<Steps>
  <Step title="Open troubleshooter settings">
    * **Windows 11:** Go to **Settings > System > Troubleshoot > Other troubleshooters**.
    * **Windows 10:** Go to **Settings > Update & Security > Troubleshoot > Additional troubleshooters**.
  </Step>

  <Step title="Run the Windows Update troubleshooter">
    Select **Run** next to **Windows Update** and apply any fixes it suggests.
  </Step>
</Steps>

### Fix 3: Free up disk space

Large feature updates need plenty of space to download and unpack.

<Steps>
  <Step title="Check free space">
    Open **File Explorer > This PC** and check the free space on drive **C:**. Aim for at least **20 GB** free.
  </Step>

  <Step title="Run Disk Cleanup">
    Search **Disk Cleanup** in Start, choose drive **C:**, then select **Clean up system files**.
  </Step>

  <Step title="Delete old update files">
    Check **Windows Update Cleanup**, **Temporary files**, and **Delivery Optimization Files**, then select **OK**.
  </Step>
</Steps>

<Tip>
  On Windows 11, you can also use **Settings > System > Storage > Cleanup recommendations** to free space quickly.
</Tip>

### Fix 4: Reset the Windows Update cache

This is the most effective fix for 0x80240034. It deletes the broken download so Windows can start fresh.

Open **Command Prompt as administrator** and run these commands one by one:

```bash Reset Windows Update cache theme={null}
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
```

Restart your PC and check for updates.

### Fix 5: Make sure update services are running

<Steps>
  <Step title="Open Services">
    Press **Win + R**, type `services.msc`, and press **Enter**.
  </Step>

  <Step title="Check these services">
    Find each service below, double-click it, set **Startup type** as shown, and select **Start** if it is stopped:

    * **Windows Update:** Manual (or Automatic)
    * **Background Intelligent Transfer Service (BITS):** Manual (or Automatic)
    * **Cryptographic Services:** Automatic
  </Step>

  <Step title="Apply and retry">
    Select **OK**, then try Windows Update again.
  </Step>
</Steps>

### Fix 6: Turn off metered connection, VPN, and antivirus

1. Go to **Settings > Network & internet**, open your Wi-Fi or Ethernet connection, and turn off **Metered connection**.
2. In **Settings > Windows Update > Advanced options**, turn on **Download updates over metered connections** if available.
3. Disconnect any VPN and temporarily pause third-party antivirus. Turn them back on after the update installs.

### Fix 7: Install the update manually

If Windows Update keeps failing, download the update yourself.

<Steps>
  <Step title="Find the KB number">
    Go to **Settings > Windows Update** (or **Update history**) and note the KB number of the failed update, for example **KB5031455**.
  </Step>

  <Step title="Open the Microsoft Update Catalog">
    Visit the [Microsoft Update Catalog](https://www.catalog.update.microsoft.com) and search for the KB number.
  </Step>

  <Step title="Download the right version">
    Pick the version that matches your system (Windows 11 or 10, **x64** or **ARM64**) and select **Download**.
  </Step>

  <Step title="Install it">
    Double-click the downloaded `.msu` file and follow the prompts. Restart when asked.
  </Step>
</Steps>

### Fix 8: Repair system files with DISM and SFC

Damaged system files can stop updates from downloading or installing correctly.

Open **Command Prompt as administrator** and run:

```bash Repair system files theme={null}
DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow
```

Wait for both scans to finish, restart your PC, and try again.

### Fix 9: Use the Windows Installation Assistant

For large feature updates (such as a new Windows 11 version), Microsoft's **Installation Assistant** can update your PC without Windows Update.

1. Go to Microsoft's official **Download Windows 11** page.
2. Under **Windows 11 Installation Assistant**, select **Download Now**.
3. Run the tool and follow the prompts. Your files and apps stay in place.

## How to prevent error 0x80240034

* Keep at least 20 GB of free space on drive C:.
* Do not turn off your PC while updates are downloading.
* Avoid metered connections when big updates are due.
* Run Disk Cleanup every few months to remove old update files.

## Frequently asked questions

<AccordionGroup>
  <Accordion title="What is WU_E_DOWNLOAD_FAILED?">
    It is the internal name for error 0x80240034. It means Windows Update could not finish downloading an update.
  </Accordion>

  <Accordion title="Why is my update stuck at 0% or 99% with 0x80240034?">
    The download is stuck because of a damaged update cache or a stopped service. Resetting the Windows Update cache (Fix 4) usually solves it.
  </Accordion>

  <Accordion title="Is it safe to delete the SoftwareDistribution folder?">
    Yes. It only stores temporary update files. Windows creates a fresh folder automatically. Renaming it, as shown in Fix 4, is the safest way.
  </Accordion>

  <Accordion title="Will fixing 0x80240034 delete my files?">
    No. None of these fixes remove your personal files or apps.
  </Accordion>

  <Accordion title="Does 0x80240034 happen on Windows 11?">
    Yes. It appears on both Windows 10 and Windows 11, and the same fixes work on both.
  </Accordion>
</AccordionGroup>


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