: If you are on an offline machine, you may need to use the Microsoft .NET Framework 3.5 Service Pack 1 (Full Package) as a standalone installer. Summary of Key Information Feature Parent Framework .NET Framework 3.5 (includes 3.0 and 2.0) Installation Path Windows Features > .NET Framework 3.5 Developer Tools
(or 3.5, which includes 3.0) via Windows features. This "legacy" version is built into the framework and often doesn't require a separate standalone download for modern Windows systems. Microsoft Learn Installation Steps Enable through Windows Features Search for "Turn Windows features on or off" in your Windows search bar and open it. .NET Framework 3.5 (includes .NET 2.0 and 3.0) in the list. Check the box, click download+install+windows+workflow+foundation+version+3042032