Unlike newer versions like .NET 4.x—which typically replace their predecessors—the 3.5 version is a superset. When you install or enable .NET 3.5, you are effectively installing:
Fully compatible. Use the Windows Features dialog or DISM method. net framework 35 includes net 20 and 30 download link
On modern Windows systems, .NET 3.5 is usually pre-packaged as an optional feature and does not require a separate file download if you have an internet connection. Unlike newer versions like
added visual and communication libraries (WPF, WCF) on top of that 2.0 engine. .NET 3.5 added further features like LINQ and AJAX. net framework 35 includes net 20 and 30 download link