Download Net Framework 3.5 Windows 10 64 Bit Offline Installer Work Page

The .NET Framework 3.5 is a critical piece of software infrastructure required to run thousands of legacy applications on Windows 10. While Windows 10 comes pre-installed with newer versions like .NET 4.8, many older games and enterprise tools specifically demand version 3.5 to function. If you are working in an environment without internet access or need to deploy this across multiple machines, using an offline installer is the most efficient method. Why You Need the Offline Installer

Check the Source Path: Ensure your path ends in \sources\sxs. The folder should contain files like microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab.
Architecture Mismatch: Ensure your Windows 10 ISO matches your installed system (e.g., if you are running 64-bit Windows, you must use a 64-bit Windows 10 ISO, not a 32-bit one).

Place your offline sxs folder somewhere like C:\OfflineInstall\sxs.
Open Command Prompt as Administrator.

Type the following command, updating the path to your sxs folder:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:C:\OfflineInstall\sxs

Press Enter. The progress will climb from 0% to 100%.
When you see "The operation completed successfully", reboot your PC.

Step 4: Watch the Magic He pressed Enter. A progress bar appeared: [==========================100.0%==========================]
The tool said: "The operation completed successfully." No internet required. No shady downloads. It used the official Microsoft files straight from his own USB. Check the Source Path: Ensure your path ends

: Mount your Windows 10 ISO or insert your installation USB drive. Identify Drive Letter and note the drive letter for the installation media (e.g., Open Command Prompt : Search for in the Start menu, right-click Command Prompt , and select Run as administrator Execute Command : Paste the following command, replacing with your actual drive letter: right-click Command Prompt