I ran across this issue again (figured it was due to the media not being available) and decided to document the resolution. 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 … Continue reading How to install .NET Framework 3.5 on Windows Server 2012 and Windows Server 2012 R2