Windows 10: Why is defender failing to update?

Protection Definitions are out of date. Security intelligence version 1.431.4.0 created on 2025060130at 0432 and updated 2025-06-13, failed to find and upload latest update

:)

 

Windows 10 fails to update


When you finish testing the Avast suggestion, make sure that you restart your machine.

Then if the issue persists, please return to the trouble shooting list in post# 89

I think there are three steps that remain; the WU troubleshooter, reset WU components, and manual WU reset.

 

Defender updates no longer shown

Hi,

Thank you for posting the query on Microsoft Community.

I appreciate your interest on Windows 10.

I suggest you to follow the steps below:

• Type defender in the search box.
• Click on update.
• Check for the date on which defender is being updated.
• If the recent date is mentioned then it will not show in the Automatic Updates.
• Also click on update definition and check if any update is pending.

Please get back to us with updated status. We will be happy to assist you further.

 

Update to Windows Defender (KB4052623) fails - labelled security risk!

I have a laptop running Windows 10 version 20H2. I have just tried to update it, using the normal updating process. A Security Intelligence update KB2267602 downloaded and installed successfully. But the other update offered, an "Update for Microsoft Defender Antivirus antimalware platform KB4052623 (Version 4.18.2202.4)" failed. A retry failed. So I ran the Update Troubleshooter and tried again. Failure. I did Disk Cleanup and tried again. Failure. The error code given is 0x80070643. So (both puzzled and curious) I then thought I would look at the Microsoft Update Catalog and perhaps download this update directly and install it. I found it listed, and hit "Download". There are three .exe files. They would not download. And - here is the real reason for my forum post - when I right-clicked to bring up the Firefox browser download info popup, all three files were listed with a warning "File not downloaded: Potential security risk". Eh??? What is going on? I don't have any additional or alternative antivirus software installed, so I'm relying on Windows Defender. I would quite like diagnosis/explanation/solution rather than having to move to the radical step of a system reinstall. What further checks or troubleshooting steps should I take, and in what order?