dism /online /Add-Package /PackagePath:C:\temp\netfx3.cab /LimitAccess /IgnoreCheck
To get the correct CAB file for your specific version of Windows, you must extract it from a Windows ISO or installation USB. microsoft-windows-netfx3-ondemand-package.cab Location on Media [Drive Letter]:\sources\sxs\ Installing Using the CAB File
If you do not have a Windows ISO handy, or if you are looking for a standalone update package (specifically KB5035849 or similar cumulative updates that refresh the .NET framework), you can extract the CAB file from a Windows Update Package (.msu). cab file for .net framework 3.5
dism /online /Add-Package /PackagePath:\\server\deploy\net35\netfx3.cab /LimitAccess
Starting with Insider Build 27965, Microsoft is moving away from including .NET 3.5 as an optional component, eventually requiring a standalone installer. dism /online /Add-Package /PackagePath:C:\temp\netfx3
The standard "Turn Windows features on or off" method or the online web installer has several failure points:
| Method | Pros | Cons | |--------|------|------| | Windows Features GUI | Simple for home users | Fails often without internet or WSUS | | Offline EXE installer | Works for older OS (Win7/8) | Won’t install cleanly on Win10/11 without tweaks | | | Works without internet, fast, reliable | Requires admin command line | The standard "Turn Windows features on or off"
C:\temp\microsoft-windows-netfx3-ondemand-package.cab