While trying to install software for our security cameras I needed to install Microsoft .NET Framework 3.5. When trying to install the .NET Framework it presented me with an error stating that I should install it through the Role Management Tool.
As Windows Server 2008 R2 has .NET Framework 3.5.1 you’re not able to install version 3.5. However, the description is a bit misleading because it’s talking about roles, while in fact it’s a feature that needs to be installed.
You can install the feature by clicking on the Add Features link in the Server Manager and selecting