| Problem | Likely cause | Fix | |--------|--------------|-----| | "Error 0x800f081f" | Source files not found/unreadable | Double-check path, ensure CAB matches your (e.g., Win10 22H2 Home needs a CAB from the same build). | | "The source files could not be downloaded" | Windows still tries Windows Update | Add /limitaccess to force local source only. | | "Error 0x80070003" | Path typo or missing file | Use Tab autocomplete for the path. | | Installation hangs | Antivirus scanning the CAB | Temporarily disable real-time scanning (re-enable after). |
Press Windows Key + R , type optionalfeatures , and press .
Get-WindowsFeature -Name NET-Framework-Features Download Microsoft-windows-netfx3-ondemand-package.cab
Installation 99%...
If you have a Windows installation USB drive or an ISO file mounted, the CAB file is already present in the \sources\sxs\ folder. Look for a file named microsoft-windows-netfx3-ondemand-package.cab . This is the safest, fastest method because the file is directly from Microsoft and digitally signed. | Problem | Likely cause | Fix |
@echo off dism /online /add-package /packagepath:\\server\share\netfx3.cab /quiet /loglevel:1
The -LimitAccess flag prevents fallback to Windows Update. | | Installation hangs | Antivirus scanning the
dism /online /add-package /packagepath:C:\netfx3\microsoft-windows-netfx3-ondemand-package.cab Use code with caution.
In corporate environments, local group policies may prevent DISM from installing optional features. Open gpedit.msc via the Run dialog ( Win + R ).
Using the offline cabinet file ( Microsoft-Windows-NetFx3-OnDemand-Package.cab ) is the most reliable method to install .NET Framework 3.5 without an active internet connection. 1. Where to Safely Source the CAB File
How to Download and Install Microsoft-Windows-NetFx3-OnDemand-Package.cab