Microsoft Defender Offline
Microsoft · Security · Win 11 / Win 10
Points to Microsoft, not to a mirror
Microsoft Defender Offline is a from Microsoft for Security on Windows 11 and Windows 10. The download is published on learn.microsoft.com — Microsoft's own servers — and the link was last opened and checked on 04 November 2026.
What Microsoft Defender Offline is
Microsoft's boot-time scanner, which runs outside Windows so it can remove rootkits and persistent threats that load before the antivirus does.
What the current release changes
Security content the publisher ships outside the monthly cumulative update. This listing records the publisher’s current build, ~300 MB, for Windows 11 and Windows 10. The download link was last opened and checked on 04 Nov 2026.
Who needs it
Install it when Windows Update stops short: an update that keeps failing, a machine deliberately kept offline, or a build that needs this package before it can reach the network. It is the payload Microsoft ships through Windows Update, taken from Microsoft's own download endpoints rather than a mirror.
How to install it
Download from learn.microsoft.com, then either run the package or mount the image and restart to finish servicing. Keep the machine on mains power for cumulative updates and feature images.
Where the download comes from
PC Updater hosts no files. The button above opens learn.microsoft.com, and this page only summarises what Microsoft publishes: version, supported Windows releases, package size and requirements. If a page ever presents itself as a mirror of Microsoft, close it and use the official download instead.
Before you install
- A blank CD, DVD or USB drive
- Administrator rights
- Several hours of downtime
Package data
- Vendor
- Microsoft
- Component
- Security
- Version
- Current
- Windows
- Windows 11, Windows 10
- Package size
- ~300 MB
- Released
- Not recorded
- Link checked
- 04 November 2026
- Status
- current
Common questions
Is Microsoft Defender Offline free?
Yes. Microsoft publishes it at no charge, and the download button opens learn.microsoft.com rather than an ad-funded mirror. A few publishers ask for a short form before the download starts — that form lives on their site, not here.
Which Windows versions does Microsoft Defender Offline support?
The listing covers Windows 11 and Windows 10. The listing is current, so this is the version to install unless your PC maker ships its own tuned build.
Can I install it instead of running Windows Update?
Yes. It is the same servicing payload, and installing it by hand is the usual fix when Windows Update keeps failing. It still needs a restart, and a later cumulative update may replace it.
Is Microsoft Defender Offline safe to install?
The file comes from Microsoft's own server. Check the digital signature on the downloaded file before running it, and treat any copy offered by a third-party download site as untrusted.
More from Microsoft
| Package | Target | Checked | Link |
|---|---|---|---|
Microsoft · Windows Update · vMonthly rollup | Win 11 | 02 Nov 2026 | Direct |
windowsWindows 11 25H2 ISO Microsoft · Feature update · v25H2 | Win 11 | 04 Nov 2026 | Direct |
Microsoft · Feature update · vLatest release | Win 11 · Win 10 | 02 Nov 2026 | Direct |