Install .NET 3.5 on Windows Server 2012 or 2012 R2

Problem Description : 

When trying to install .NET 3.5 from the Server Manager GUI features you see a message "Do you want to specify an alternate source path? One or more installation selections are missing source files…"

 Resolution : 

Enable .NET Framework 3.5 by using the Add Roles and Features Wizard

You can use Server Manager to enable .NET Framework 3.5 for a local or remote installation of Windows Server 2012 R2.

Requirements

Windows Server 2012 R2 

Installation media

STEPS

In Server Manager, click Manage and then select Add Roles and Features to start the Add Roles and Features Wizard.

On the Select installation type screen, select Role-based or feature-based installation.

Select the target server (local).

On the Select features screen, check the box next to .Net Framework 3.5 Features.

Connect Windows 2012 ISO in VM using CD/DVD Drive 1 icon. 

On the Confirm installation selections screen, a warning will be displayed asking Do you need to specify an alternate source path?. Click 'Specify an alternate source path' link at the bottom to specify the path D:\sources\sxs folder on the installation media and then click OK. After you have specified the alternate source, click the X next to the warning, and then click Install. 

.NET 3.5 installation should complete successfully.

 Revision Date : 12/10/2014