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Enabling .NET Framework 3.5 (Microsoft-Windows-NetFx3-OnDemand-Package.cab) on Windows Server 2012 R2

Windows Server 2012 R2 does not include .NET Framework 3.5 full installation files by default. When you install or enable the .NET Framework 3.5 (which includes .NET 2.0 and 3.0), Windows tries to retrieve required files from Windows Update or from local installation media. The package commonly referenced for offline installations is named Microsoft-Windows-NetFx3-OnDemand-Package.cab. This article explains what that CAB is, why you might need it, and how to install .NET Framework 3.5 on Server 2012 R2 from local sources or a network share (without requiring direct internet access).

Critical Security Note: Never download CAB files from third-party blogs or file-sharing sites. Those files are frequently injected with malware. Use only a SHA-1 verified copy from a known-good Microsoft ISO. Enabling

file, you typically need to point the installer to the original installation media. This package is required because the files are not installed by default to save disk space (a feature known as "Features on Demand"). Installation Overview This usually means the path to the source files is incorrect

• This usually means the path to the source files is incorrect.
• Fix: Verify that the drive letter of the mounted ISO is correct and that the sxs folder exists inside sources.

DISM.exe /online /enable-feature /featurename:NetFX3 /All /Source:C:\dotnet35 /LimitAccess Use code with caution. Copied to clipboard /LimitAccess flag is critical; it tells Windows why you might need it

dism /online /enable-feature /featurename:NetFx3 /all /limitaccess /source:D:\sources\sxs Using PowerShell You can achieve the same result via PowerShell

Q3: My organization blocks ISO downloads. Is there a direct Microsoft download link?

Microsoft does not offer a standalone direct download for just the CAB file. You must extract it from an official ISO. However, you can use the DISM /Online /Enable-Feature /FeatureName:NetFx3 /All without any source – this forces Windows Update. Only use that if your server has internet access.