Copy and paste the following Deployment Image Servicing and Management (DISM) command into the window. Replace X: with the exact drive letter of your mounted Windows ISO:
The standard Windows feature installer relies heavily on an active internet connection to download files from Microsoft servers. An offline installer is highly beneficial because it:
Allows system administrators to install the runtime on multiple PCs quickly using a USB drive.
If you have a Windows 10 or 11 ISO file or USB recovery drive, you can install .NET 3.5 completely offline using the tool. Copy and paste the following Deployment Image Servicing
Installing the .NET Framework 3.5 offline is a straightforward process, especially when using the DISM command-line tool with a Windows installation ISO. This ensures that your older applications and games run smoothly on Windows 10 and 11, regardless of your internet connectivity.
If you have no internet access, you can install it using a Windows ISO or installation USB. Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
Normally, Windows prompts you to download .NET Framework 3.5 via Windows Update when an application requests it. However, an offline installer or offline enablement method is highly necessary in several scenarios: If you have a Windows 10 or 11
Step 2: Run the Deployment Image Servicing and Management (DISM) Tool
The full package contains all components needed for a local installation without an internet connection during the setup process.
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs If you have no internet access, you can
Method 3: Downloading the Official Executable (Requires Temporary Internet Access)
I can provide the exact command scripts or troubleshooting steps tailored to your environment. Share public link
This is the most reliable "true offline" method. You will need a Windows 10 or 11 ISO file or a bootable USB drive.
This installer may still try to fetch some components from Windows Update. If that fails, use Method 2 .