For those who prefer PowerShell, the process is identical. Right-click the Start button and select "Windows PowerShell (Admin)" or "Terminal (Admin)". Run the same command:
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However, as many have discovered, attempting to install .NET 3.5 directly through the standard "Turn Windows features on or off" wizard frequently leads to failure. This is because Windows 10 does not store the installation files locally; it attempts to download them from Windows Update, a process that can fail for numerous reasons such as network restrictions, corporate firewalls, disabled Update services, or the machine being completely offline. If you’ve ever watched the progress bar sit at 50-80% before timing out or throwing a cryptic error, you know exactly what this feels like.
This is the most reliable way to install it without an internet connection. Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
Windows 10 usually prompts you to download .NET 3.5 via Windows Update the moment an older application requests it. However, the online method fails in several scenarios: Net Framework 3.5 Offline Installer Windows 10 64 Bit
He didn’t have the ISO mounted. So instead, he inserted the original Windows 10 installation USB he’d used for Mr. Ellsworth’s PC. The one labeled in Sharpie: WIN10 64 CLEAN.
If your offline installation fails, it is usually due to one of three issues: 1. Wrong Drive Letter
This occurs when the system tries to look at a local Windows Server Update Services (WSUS) server instead of the specified offline folder.
Once installed, activate the framework by running the following command in the Command Prompt (as administrator): For those who prefer PowerShell, the process is identical
If you want to know more about the best ways to get this installed, I can:
Note the drive letter assigned to your USB or mounted ISO (e.g., Johnson Controls 2. Run the Offline Installation Command Start menu , right-click on Command Prompt , and select Run as administrator Copy and paste the following command into the window:
Look for a value named UseWUServer and change its data from 1 to 0 .
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dism /online /get-features | find "NetFX3"
The Windows version must match your currently installed OS build. Step-by-Step Instructions
This error usually indicates a conflict with pending Windows updates or a security application block.
/LimitAccess : Prevents Windows from trying to use Windows Update. 4. Verify the Installation
Установка .NET Framework 3.5 в Windows 10 - Microsoft Learn
: Open the Registry Editor ( regedit ) and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU . Look for a value named UseWUServer and temporarily change its data value from 1 to 0 . Restart the Windows Update service, run the DISM offline installation command again, and then revert the value back to 1 . Verifying the Installation