Issue – While Installing SQL Server 2012 on windows 2012 server I have received below error, which indicate .Net 3.5 is not installed on this machine.

In windows server 2012 .Net 3.5 do not install by default as it’s come with .Net 4.5.

Let’s learn how to install .Net 3.5 on windows 2012 box.

Go to control Panel –> Select Turn windows  features on or off

or go to Server Manager –> Add roles and features

It launch  new window –> Next

select –> “Role-based or feature based installation” –> Next

Go –> Next –> Next –> Select “.Net Framework 3.5 Feature” –> Next

Select –> Specify an alternate source path

Find  windows media directory and go to “Source\sxs” path Mine is installed in D:\ so for me it’s “D:\Source\sxs”

Provide directory path and click OK.

Click on Install –>

It will take few minute and then your installation done.

Or you can use below command –

dism /online /enable-feature /featurename:NetFx3 /source:D:\sources\sxs