This guide organizes how to install NET Framework components on a Windows server using Server Manager.
Login to your windows server.
Open Server Manager > Manage > Add Roles and Features
Than Next > Role based… > Next > Next > Next
Then select only the NET Framework you want to install. Please note that to complete the installation, a server reboot is required.
Then Next and Install.
Wait for it to finish. Then don't forget to reboot to complete the installation.
Additional:
Installation applies other windows features, not just the NET Framework
There are more features available in Server Manager