dism /mount-image /imagefile:"D:\sources\install.wim" /index:1 /mountdir:"C:\mount"
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The microsoft-windows-netfx3-ondemand-package.cab is approximately . The extracted installation consumes about 400 MB on your system drive.
Press . The progress bar will count up to 100%. Once completed, close the command prompt and restart your computer. Method 2: Enabling via Windows Features (Local Source) Net Framework 3.5 Offline Installer Windows 10 64 Bit
Установка .NET Framework 3.5 в Windows 10 - Microsoft Learn
Verify the installation by checking the .NET Framework version in the Registry Editor (Regedit.exe) or by running the following command in the Command Prompt:
If you lack the full Windows 10 ISO (which is roughly 4-5GB), you can download a small, dedicated CAB file. This method is faster and ideal for technicians carrying multiple tools on a single USB drive. dism /mount-image /imagefile:"D:\sources\install
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:E:\sources\sxs
When searching for a convenient alternative, you may encounter third-party websites offering standalone, one-click .exe offline installer packages for .NET 3.5.
Offline installations can sometimes trigger specific error blocks due to system restrictions. Error Code 0x800F0906, 0x800F0922, or 0x800F081F Method 2: Enabling via Windows Features (Local Source)
If you run the offline installer and it still prompts to "Download and install this feature", you are not using the correct offline method. The standard web installer and the Turn Windows features on or off wizard are inherently online. You must use the DISM command with the /LimitAccess flag to force it to use your local source. As noted by many on Microsoft Q&A, even the so-called "full package" downloaded from Microsoft's website can trigger an online download if not used with the proper DISM commands.
If you have an internet connection and prefer a standalone file (though it still typically requires an internet connection to complete installation on Windows 10), you can find them at Microsoft Learn or the following direct pages: Full Package (.NET 3.5 SP1) (approx. 231 MB) Standard Installer error code