One of the most common tasks I have to perform on Microsoft Server 2012 is to install multiple version of .net. This tutorial show how to add .net 3.5 to Windows Server 2012. There are several different ways to accomplish this task. This tutorial will cover the install using the GUI. Please leave comments and suggestions about the post below.
The first step is click on Manage server in the upper right hand corner of server manager. Select add roles and features from the drop down menu.
Select next on the before you begin screen.
Select Role-based or feature-based installation and click next.
Select a server from the server pool and click on next.
Since we are adding a server feature select next to bypass the server roles.
On the features screen select .Net Framework 3.5 Features and click next.
The below screen shows the summary of what will be installed. Double check .NET 3.5 is shown and select Install.
Verify final results to insure the role or feature has completed successfully. You should also check for any updates that might need to be installed now that there are new roles or features installed on the server.