: Microsoft .NET Framework 3.5 SP1.
Download Microsoft . NET Framework 3.5 Service Pack 1 from Official Microsoft Download Center. Download Center. Download Center. Microsoft .NET Framework 3.5 Service Pack 1
: You generally do not need a separate download. You can enable it by going to Turn Windows features on or off in your Control Panel and checking the box for .NET Framework 3.5 (includes .NET 2.0 and 3.0) .