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: Error codes like 0x800F0906 , 0x800F0954 , or 0x800F081F frequently block the online installation process. Method 1: The Official Command Prompt Method (Recommended)
Insert your Windows 10 USB flash drive or double-click your Windows 10 ISO file to mount it. Net Framework 3.5 Offline Installer Windows 10 64 Bit
dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution. Copied to clipboard 4. Wait for Installation to Complete to run the command. You will see a progress bar in the command prompt. Wait until it reaches 100% and displays the message: "The operation completed successfully."
Mount the Windows 10 ISO or insert the installation media and note its drive letter (e.g., D:). Is this system managed by an
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
The is essentially a .cab (cabinet) file or the sxs folder from a Windows 10 installation ISO. Once you have this local source, you can install .NET 3.5 on dozens of machines without an internet connection. You will see a progress bar in the command prompt
Open This PC and look for the newly mounted drive (for example, Drive D: , E: , or F: ).
This error almost always indicates that the DISM tool cannot find or read the source files. The most likely cause is an incorrect drive letter for your mounted ISO or a corrupted package. Double-check the drive letter in File Explorer and ensure your /Source path in the DISM command matches it exactly.
The command-line tool is the most reliable method for installing .NET Framework 3.5 offline on Windows 10. It uses the sources\sxs folder from an original Windows 10 ISO image.
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.