.NET Framework 3.5 Service Pack 1 Runtime
Always ensure you are downloading from microsoft.com to avoid malware or corrupted installers found on third-party "driver" sites. Troubleshooting Common Issues "Error code: 0x800F0906"
A common point of confusion for users is whether they need to download versions 2.0 and 3.0 separately. The short answer is: The .NET Framework 3.5 is a "cumulative" update, meaning it natively includes the full feature sets of versions 2.0 and 3.0. net framework 35 includes net 20 and 30 download link
Understanding .NET Framework 3.5: Why It Includes 2.0 and 3.0 (and How to Download It)
If you are working on a machine without an active internet connection or need to deploy it across multiple computers, you can use the standalone installer. Understanding
Use the via Command Prompt (Admin) to install it from a Windows installation media (USB/ISO). Do I need .NET 4.8 too?
Check if a Firewall or Antivirus is blocking Windows Update. Check if a Firewall or Antivirus is blocking Windows Update
On modern operating systems, .NET 3.5 is already "on" your computer but disabled by default. You don't actually need an external download link; you just need to enable it.