Do you need to specify an alternate source path while installing .net framework on window server

How to install .NET Framework 3.5 on Windows Server 2012 

In this article we will see a error when trying to add the .NET Framework 3.5 feature through the Add Roles and Features Wizard in Server 2012 (R2), you receive the following error:

Do you need to specify an alternate source path?  One or more installation selections are missing source files on the destination server.  The server will try to get missing source files from Windows Update, or from a location that is specified by Group Policy.  You can also click the “Specify an alternate source path” link on this page to provide a valid location for the source files.





Solution: Complete the steps below to manually install .NET Framework 3.5 from the Server 2012 (R2) installation media.  You can complete this task via command line or via the wizard.


Step 1: Insert the Windows Sever 2012 installation media



Step 2: Open up an elevated command prompt



Step 3: Execute the following command



dism /Online /Enable-Feature /FeatureName:NetFX3 /All /Source:D:\Sources\SxS\ /LimitAccess



Here is a breakdown of the following command:

/Online                 – Targets the running operating system.
/Enable-Feature – Enables a specific feature in the image.
/All                          – Enables all parent features of the specified feature.
/LimitAccess        – Prevents DISM from contacting WU/WSUS.


Step 1: Insert the Windows Sever 2012 installation media



Step 2: On the Add Roles and Features wizard, click on Specify an alternate source path




Step 3: Enter D:\Sources\SxS\ to point to the Server 2012

                             

Step 4 :Once done installing through the GUI or command prompt, if you navigate back to the Add Roles and Features Wizard, you should see the feature has been successfully installed now.


Hope it will help to resolve your query.