Offline installation of .NET 3.5 features when online updates are blocked or unavailable. 2. Prerequisites for Installation Before you begin, ensure you have the following:

Ensure the ISO or .cab file you are using matches the exact version of Windows Server 2012 R2 you have installed.

The required file is: microsoft-windows-netfx3-onDemand-package.cab

dism /online /enable-feature /featurename:NetFX3 /All /Source:C:\sxs\ /LimitAccess Use code with caution.

You can also use the Server Manager to install the .NET Framework 3.0 On-Demand Package.

Inside D:\sources\sxs\ , you will see the file named: microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab How to Install .NET 3.5 Using the CAB Source

You must provide a valid source, which is usually the \sources\sxs folder found on the Windows Server 2012 R2 installation ISO or DVD, which contains the microsoft-windows-netfx3-ondemand-package.cab file. Prerequisites Windows Server 2012 R2. Administrator access.

If you prefer a visual interface, you can still use Server Manager, provided you configure the alternate path option. Open and click Add Roles and Features . Advance through the wizard to the Features step.

Go to > Administrative Templates > System .