Users often search for a "new" download of this file because they encounter error codes (commonly 0x800f081f or 0x800f0906 ) when trying to install .NET 3.5 via the Server Manager GUI. The error messages often state that "The source files could not be found," leading users to believe they need to download the .cab file manually.
dism /Online /Add-Package /PackagePath:C:\Temp\NetFX3\Microsoft-Windows-NetFx3-OnDemand-Package.cab Users often search for a "new" download of
Instead of downloading a standalone .cab from third-party sites, which can be risky, the official and safest way to obtain this package is from your . dism /online /get-features | findstr "NetFx3" Here’s a
dism /online /get-features | findstr "NetFx3" which can be risky
Here’s a technical write-up covering the download, deployment, and use of the microsoft-windows-netfx3-onDemand-package.cab for Windows Server 2012 R2 in a modern (air-gapped or offline) scenario.
Usually not, but a reboot is recommended for full system consistency.