This is the gold-standard method used by IT professionals. It uses the Deployment Imaging Servicing and Management (DISM) tool, which is built directly into Windows.
Successfully installing the bypasses the need for internet connectivity and avoids the common failures associated with standard executable bootstrappers. For a single user, the most straightforward path is mounting the Windows 10 ISO and running the DISM command ( DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:E:\sources\sxs ). For a system administrator, SCCM or Group Policy deployment is the optimal solution. Net Framework 3.5 Offline Installer Windows 10 64 Bit
@echo off Title .NET Framework 3.5 Offline Installer echo Readying the installation... for %%I in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do if exist %%I:\sources\sxs set DriveLetter=%%I if defined DriveLetter ( echo Found installation media on drive %DriveLetter%: Dism /online /enable-feature /featurename:NetFX3 /All /Source:%DriveLetter%:\sources\sxs /LimitAccess ) else ( echo Error: Windows 10 Installation Media not found! echo Please insert a USB or mount an ISO and try again. ) pause Use code with caution. Click . Change the "Save as type" dropdown to All Files (*.*) . Name the file InstallNet35.bat and click Save . This is the gold-standard method used by IT professionals
Once DISM confirms the operation completed successfully, restart your computer for the changes to take effect. For a single user, the most straightforward path
Click the Start menu, type cmd , right-click on Command Prompt , and select Run as administrator .
He opened PowerShell as Admin on the Dell. The cursor blinked patiently.
Ensure you are pointing to the sources\sxs folder specifically, not just the root of the drive.