Hi,
My name is Igor, it's a pleasure for me to help others and I'll try to help you. I am merely a fellow user trying to provide insight and information that may be helpful to others.
Please show a screenshot with error code and error message.
2025-08 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5063878) (26100.4946)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(150.4, 19%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDH%3C/text%3E%3C/svg%3E)
DINO HERBERT
60
Reputation points
2025-08 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5063878) (26100.4946)
This update will not install. It downloads completely, installs, but then has an error.
Laptop details:
Windows 11 Home, version 10.0.26100 Build 26100, Dell Inspiron 3593, x64-based, System SKU 0979, Intel Core i7 processor, BIOS version 1.30.0, 3/7/24, SMBIOS version 3.1, embedded controller version 255.255, BIOS mode UEFI
I have downloaded, installed several times, restarted, rebooted
Windows Update trouble shooter could not fix it
I downloaded manually from MS update catalog website, but it still did not work.
I have run chkdsk, run system file checker sfc /scannow and rebooted, all to no avail.
I have seen many people with the same problem. Any solutions?
Windows for home | Windows 11 | Windows update
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(300.8, 1%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EWS%3C/text%3E%3C/svg%3E)
Wilton Sampaio 0 Reputation points2025-08-17T16:59:22.85+00:00 Não consigo instalar a seguinte instalação: Windows 11 versão 24H2 para sistemas baseados em x64 (KB5063878) (26100.4946).
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(140.8, 89%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
matt 5 Reputation points2025-08-18T17:30:37.02+00:00 This update has broken the ability to play games unless i uninstall the update (the security one that rolled out next to this update). So when i left the pc on stanby or sleep the next day the update is magically reinstalls (the security one). But thsi specific one refuses to download.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(185.6, 8%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAS%3C/text%3E%3C/svg%3E)
Andrew Safe 0 Reputation points2025-08-22T17:57:12.8833333+00:00 Its doint the same thing for me and not installing
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(166.4, 84%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESS%3C/text%3E%3C/svg%3E)
Shivesh SB 0 Reputation points2025-08-22T18:03:52.24+00:00 Same, it fails to download and the error code is "Download error - 0xca020001"
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(3.2, 82%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EFM%3C/text%3E%3C/svg%3E)
Floyd Marks 0 Reputation points2025-09-16T06:22:00.9833333+00:00 I ran into the same problem with KB5063878 on my Dell machine — it would download, install, then fail on reboot. What fixed it for me was:
Running
DISM /Online /Cleanup-Image /RestoreHealthin admin PowerShellClearing the SoftwareDistribution folder before retrying Windows Update
Installing the cumulative update in Safe Mode with Networking
If that still doesn’t work, Microsoft usually pushes a fixed patch within a week or two.
I also found a useful troubleshooting walkthrough you can click here to check out.
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5 answers
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 10%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EIL%3C/text%3E%3C/svg%3E)
Igor Leyko 110.6K Reputation points Independent Advisor2025-08-14T19:22:43.7833333+00:00 -
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 77%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDC%3C/text%3E%3C/svg%3E)
dung cao 0 Reputation points2025-08-21T11:01:18.54+00:00 it keeps stopping at 0% and can't download please help me
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 43%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ED%3C/text%3E%3C/svg%3E)
Dave 0 Reputation points2025-08-30T17:34:10.99+00:00 Hi, I also suffered with the same issue.
- Note: I've spent about two weeks looking for an answer. Tried all methods to fix. Update troubleshooter was not working. The .net files would not install. Attempted dsim and sfc multiple times. Even tried windows installation media creation tool. Nothing worked at all. so I thought I'd post my solution.
My fix..
- Downloaded the latest win11 iso. (https://www.microsoft.com/en-us/software-download/windows11)
- When saved to PC right click on downloaded iso and mount image
- Opened file explorer and located new drive with image. run setup (This method ask if you want to keep existing user data etc, select your prefered method). I didn't alter anything as i wanted to keep my data.
- In my experience, whilst install was running, the windows update checker got stuck at 46% (for a very a long time). I retried several times but the install kept on getting stuck at the same point. now my easy fix.
- Keep connected to the internet to start the install process. when asked to accept user license, before pressing next, I disconected from the internet, the process continued and did a clean install without loosing data.
- After PC re-started, checked windows update, several updates found and installed them. did this a few times and now PC is back fully updated. With no more issues
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Igor Leyko 110.6K Reputation points Independent Advisor
2025-08-16T23:54:10.7466667+00:00 You may try so called repair install. Create Windows installation media as described at https://www.microsoft.com/software-download/windows11 but do not boot from this media, run setup.exe file from running Windows instead. This will keep all your files, apps and settings.
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Igor Leyko 110.6K Reputation points Independent Advisor
2025-08-16T10:45:19.14+00:00 Did you try to install update's off-line version? What was the result?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 6%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ED%3C/text%3E%3C/svg%3E)
Debangshu 0 Reputation points2025-08-16T17:31:29.12+00:00 Hi, tried installing offline version, it failed as well...performed all of above steps with similar results
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DINO HERBERT 60 Reputation points
2025-08-16T20:39:03.7966667+00:00 As mentioned in my original post, it didn't work
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Igor Leyko 110.6K Reputation points Independent Advisor
2025-08-15T20:55:43.69+00:00 Please run Windows update troubleshooter and show the result.
Try to install update's off-line version - http://www.catalog.update.microsoft.com/Search.aspx?q=KB5063878
Run command prompt as administrator, run
chkdsk C: /r /scan
command and show the result.