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Install .NET Framework 3.5 on Windows Server 2012:

-run POWERSHELL (as admin)
-type: Install-WindowsFeature Net-Framework-Core
-wait 10 minutes.

That should do it! Congrats!

You can check to see if it installed by:

-type: Get-WindowsFeature

And if you install the GnuWin32, you can grep to your heart's content:

-type: Get-WindowsFeature | grep -i framework