Not sure if you got my screen shot or not.
Windows 11
Microsoft Windows
Version 2SH2 (SO Build 26200.6899)
The windows 11 Pro operating system and its users' interface are protected by trademark etc...
How to fix download error code 0x80040155
![](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(230.39999999999998, 1%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECN%3C/text%3E%3C/svg%3E)
Cindy Nelson
0
Reputation points
I am getting Error code 0x80040155 when updates below fail:
- 2026-05 .NET Framework Security update (KB5087051)
- 2026-05 Security Update (KB5089459) (26200.8457)
How do I fix this please?
Thank you,
Windows for home | Other | Windows update
4 answers
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Cindy Nelson 0 Reputation points
2026-05-25T14:23:53.59+00:00 -
David-M 126K Reputation points Independent Advisor2026-05-25T14:28:59.3433333+00:00 Thanks for the clarification.
Unfortunately, the screenshot didn't come through. Are you clicking the "Insert image" button after selecting it?
I'm sorry to insist on this. But if you actually have a VPN installed, any suggestion I give won't work. So, it's good that we clarify this point before I suggest anything.
Looking forward to your reply.
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Cindy Nelson 0 Reputation points
2026-05-29T10:42:11.2833333+00:00 Sorry I am new t all of this - thank you for any help you can give me!
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Cindy Nelson 0 Reputation points
2026-05-25T14:01:08.61+00:00 Here is a screen shot of the OS build of my system
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Cindy Nelson 0 Reputation points
2026-05-25T13:54:51.81+00:00 Microsoft Defender is all I have I think - I have not installed any other antivirus software.
Also how do I check about the VPN software - I do not think I have it but not sure.
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David-M 126K Reputation points Independent Advisor
2026-05-25T14:12:42.5533333+00:00 Thanks for the clarification.
There's a simple way to see if you have a VPN installed. VPNs typically create virtual network adapters.
Please share a screenshot of the network adapters in the Control Panel.
- Press "Windows + R", type
ncpa.cpland press Enter.
A window will open with the network adapters installed on the system. Share a screenshot of this window.
By the way, the OS build screenshot didn't come through. After selecting the image file, you need to select "Insert image" to complete inserting the image into your post.
Looking forward to your reply.
- Press "Windows + R", type
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David-M 126K Reputation points Independent Advisor
2026-05-25T13:32:05.01+00:00 Hi. I'm David, and I'm happy to help you.
To be able to assist you better, please clarify the following:
- Do you have a third-party antivirus installed? If yes, which one?
- Do you have any VPN software installed? (Even if it's not running at the moment) If yes, which one?
Also. What is the current "OS Build" of your Windows 11?
- Press "Windows + R", type
winver, and click OK.
If you prefer, share a screenshot. Use the shortcut "Windows + Shift + S" to use the screenshot tool.
Be sure to censor your email address if it appears. The Microsoft Q&A is public.
Looking forward to your reply.