Installing .NET 3.5 on Windows Server 2012

I have recently purchased a backup UPS and it comes with software that can be loaded on a computer (that is connected to the UPS) so that the computer can communicate with the UPS and safely shut down.  

The software requires .NET 3.5, but vanilla Windows Server 2012 doesn't have it.  What roles/components need I install?  I tried adding the Application Server --> .NET Framework 4.5 but the software installation is still saying .NET Framework still missing.  Am I forgetting something?  

There are tons of other roles beneath Application Server, do I need to install more?

Thank you
MichaelChief Financial OfficerAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Add Roles and Features in Server Manager, skip roles, then on features, add it there - it's the first thing listed.
Add Roles and Features for .net
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