Offline installer for .Net 3.5 SP1 not working

Question

I downloaded a big file of .Net 3.5 SP1.

Now when I try to install it on Windows Server 2012, I get the following screenshot:

Answer 1

This is alternate solution when you don't have windows server installation disk

1. 1.On your local computer(not server), go to windows install directory(C:\Windows) and then find "WinSxS" directory.
2. Copy this folder to server
3. Open add roles and features wizard, go to features tab and check .Net Framework SP1.
4. Then bellow of this window click on "Specify Alternate Source Path" and in new window specify folder path that you coped early on the server.

That's it!