4.6 is the current release. Why not install that? https://msdn.microsoft.com/en-us/library/5a4x27ek(v=vs.110).aspx

You will need Admin rights and may need to reboot the server.

>Hi,
>
>I noticed that on the new server (Server 2008 r2) that customer built there is not .NET 4.5 installed (surprising to me since I have almost always see it there). So I need to install it. Since it is a customer server, I want to be extra cautious. I found this link for the download:
>
>https://www.microsoft.com/en-us/download/details.aspx?id=30653
>
>Do you think this is the right link?
>
>TIA.