For more information, see Manage add-ons in Internet Explorer 11. This ensures the add-on is installed from an identified resource. Ive uninstalled, re-installed, allowed the app in browser, A/V, and spent half a day working with the software support techs who cant figure it. I created a manual restore point today with a 'Working' PC. I restored from that point and that resolved the issue. Visual Studio 2015 Enterprise Install (working with Silverlight projects/tools) Fortunately I had a restore point created from just prior to a 'Critical Windows Update'. Im running Windows 10 IE 11 for online labs but Silverlight is not recognized. Google Chrome install (but NOT default browser) 2. The installation package of Microsoft Silverlight is digitally signed. 'Support for ActiveX has been discontinued in Microsoft Edge, and that includes removing support for Silverlight.'. If the signature is missing, the publisher information will be listed as Not verified. Internet Explorer checks the digital signature of the control's binary file when it determines the publisher. This behavior occurs because while the installation package of Microsoft Silverlight is digitally signed, the add-on file npctrl.dll isn't digitally signed. You install Microsoft Silverlight in Internet Explorer. Next, you open the Manage Add-ons feature in Internet Explorer and view the Silverlight add-on information. The publisher is listed as (Not verified) Microsoft Corporation. Original product version: Internet Explorer Original KB number: 2406108 Symptoms For more information, see Internet Explorer 11 desktop app retirement FAQ. The retired, out-of-support Internet Explorer 11 desktop application has been permanently disabled through a Microsoft Edge update on certain versions of Windows 10.

Microsoft silverlight not working edge