Dotnetfx 365.exe May 2026
A: Yes, but many apps will break. Go to Control Panel > Programs and Features > Turn Windows features on or off > Uncheck .NET Framework 3.5. Reboot.
A: The installer itself only sends telemetry about the success/failure of installation. You can block it with a firewall, but the .NET runtime does not phone home.
Even if not prompted, reboot your system. Registry changes for .NET 3.5 require a fresh boot. dotnetfx 365.exe
Once you have a verified copy of dotnetfx 365.exe, follow these steps to avoid user account control (UAC) traps and corruption errors.
Starting with Windows 8, Microsoft removed .NET Framework 3.5 from the default operating system installation. While you can enable it via "Windows Features," that method requires an active internet connection to download files from Windows Update. If you are on a secure network without internet, or if Windows Update is broken, you need the offline installer—dotnetfx 365.exe. A: Yes, but many apps will break
Close Visual Studio, SQL Server Management Studio, and any running games. .NET Framework installation requires a reboot and will fail if files are locked.
A common source of confusion is how this file relates to newer frameworks. Even if not prompted, reboot your system
| File Name | Actual Product | Use Case |
| :--- | :--- | :--- |
| dotnetfx 365.exe | .NET 3.5 SP1 | Legacy apps (2007–2015) |
| NDP472-KB4054530-x86-x64-AllOS-ENU.exe | .NET 4.7.2 | Modern Windows apps |
| dotnetfx35setup.exe | .NET 3.5 web bootstrapper | Requires internet |
| WindowsDesktopRuntime-win-x64-6.0.5.exe | .NET 6.0 | Modern cross-platform apps |
Important: You can run dotnetfx 365.exe on the same machine as .NET 4.8. They are side-by-side installations and do not conflict.
You might be asking: Doesn't Windows come with .NET Framework pre-installed? The answer is complicated.