You will not find any installation of .NET Framework 3.5 in a fresh install copy of your new server running on 2012. What can you do if you really needs it, perhaps some legacy application still needs it ? Let's see .
To install .NET Framework 3.5 to your machine :
1. Make sure you have a copy of Microsoft Windows Server 2012 ISO available or a physical disk.
We will need the file from the directory "sources\sxs"
Please drop me a PM if you need the sources file.
2. Physical access to your machine (if you are using disk) or remote access will do.
3. Powershell installed in the machine. (Yes! I like Powerful sea-shell :D )
4. Mount the ISO or put in the disk into the server.
In 2012, mounting a ISO is as simple as double clicking it, you will find it mapped to a drive letter.
5. Run this command into Powershell
Install-WindowsFeature -Name Net-Framework-Core -source [MappedDrive]:\source\sxs
6. Voila. Like magic your .NET Framework 3.5 is installed !
