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Install Microsoft .NET Framework 3.5.1

Microsoft .NET Framework 3.5.1 is an optional feature of Windows Server 2012 R2 and Windows Server 2016. It is included, but must be installed using the Add Features wizard.

To install Microsoft .NET Framework 3.5.1 on Windows Server 2012 R2

Open Server Manager and select Features.
Select Add roles and features to launch the Add Roles and Features wizard.
In the Add Roles and Features wizard, click the .NET Framework 3.5 checkbox (under the .NET Framework 3.5 Features container) and click Next.
In the Confirm Installation Selections dialog box, click Install.
When the installation is complete, click Close to finish. Check for the latest Windows updates and install any Critical or Security updates related to Microsoft .NET.

Note: A known issue occurs when attempting to install .NET Framework 3.5 on a computer running Windows Server 2012 R2 configured to use a WSUS server to receive updates or when an Internet connection is unavailable. For more information, see Microsoft KB article http://support.microsoft.com/kb/2734782.

To install Microsoft .NET Framework 3.5.1 on Windows Server 2016

Open Server Manager and select Features.
Select Add roles and features to launch the Add Roles and Features wizard.
In the Add Roles and Features wizard, click the .NET Framework 3.5 checkbox (under the .NET Framework 3.5 Features container) and click Next.
In the Confirm Installation Selections dialog box, click Install.
When the installation is complete, click Close to finish. Check for the latest Windows updates and install any Critical or Security updates related to Microsoft .NET.