Does Silverlight Still Work on Windows 11?

No — Silverlight is not available on Windows 11 in any practical sense. Microsoft ended all support for Silverlight on October 12, 2021, before most PCs had moved to Windows 11, and no browser that ships with or installs on Windows 11 will load the plugin in its normal mode. The only partial exception is Internet Explorer mode in Microsoft Edge, which an organization can configure for specific legacy sites.

Why the operating system isn't really the issue

People often frame this as a Windows 11 compatibility question, but the operating system was never the blocker. Silverlight was a browser plugin: it only did anything when a browser handed it a rectangle of the page to draw in. That hand-off happened through plugin interfaces — NPAPI in Firefox-style browsers and ActiveX in Internet Explorer — and every mainstream browser removed those interfaces years ago. We cover that history in detail in why Silverlight won't run in Chrome, Edge, or Firefox.

So even if you find an old copy of the Silverlight runtime installer, installing it on Windows 11 accomplishes nothing useful: there is no shipping browser on the system that will ask the plugin to render anything.

What about Internet Explorer itself?

Windows 11 does not include Internet Explorer as a usable standalone browser. Microsoft retired the IE11 desktop application and directs users to Microsoft Edge instead. That matters for Silverlight because IE was the last mainstream browser whose plugin model (ActiveX) could still host it.

The narrow exception: IE mode in Edge

Microsoft Edge on Windows 11 includes IE mode, a compatibility feature aimed at organizations that still depend on legacy internal sites. IE mode re-creates parts of the Internet Explorer environment, including ActiveX support, for sites an administrator has explicitly listed. In some managed environments this has kept old Silverlight-based intranet pages limping along.

Three caveats matter before anyone treats that as a plan:

• IE mode is designed for organization-managed site lists, not for casually browsing to a Silverlight page at home. See how IE mode is set up for a legacy intranet app.
• The Silverlight runtime itself is entirely unsupported — no security fixes, no compatibility fixes — regardless of what hosts it.
• Whether a given Silverlight app actually behaves in IE mode varies; we walk through the details in does Edge's IE mode run Silverlight.

What to do instead

If you hit a page on Windows 11 asking you to install Silverlight, the realistic options are:

• Check for a modern version of the site. Most public sites that once used Silverlight — video services especially — rebuilt on standard HTML5 long ago. The plugin prompt is usually a leftover on an outdated page.
• Contact the site or app owner. If it's an internal business app, the owner needs to know it is unreachable for ordinary users; migration paths like Blazor exist, per Microsoft's Blazor documentation.
• Don't hunt for unofficial runtime downloads. Third-party mirrors of a retired, unpatched plugin are a bad trade for whatever content sits behind the prompt.

The short version: Windows 11 didn't kill Silverlight — the browsers did, years earlier — and Windows 11 is simply the first Windows generation where every remaining door was already closed.