Once you have downloaded the official installer (let's assume you chose the offline .exe ), here is how to avoid common pitfalls.
Unlike modern versions, .NET 3.5 acts as a "feature stack". It includes the full runtime for versions and 3.0 , meaning you don't need to download three separate installers to get older software working. It is the foundation for technologies like Windows Presentation Foundation (WPF) and Windows Communication Foundation (WCF). Official Download & Installation Methods 1. The Standard Web Installer Download .net Framework 3.5 -includes .net 2.0 And 3.0- -NEW