The file is located on your Windows ISO or installation USB in the \sources\sxs directory.
Disclaimer: The information provided is based on typical Windows installations. Always ensure you have a backup of your data before modifying system features. microsoftwindowsnetfx3ondemandpackagecab download free link
Add-WindowsPackage -Online -PackagePath "C:\path\to\microsoft-windows-netfx3-ondemand-package.cab" The file is located on your Windows ISO
Once the ISO is downloaded, you do not need to burn it to a drive or reinstall Windows. You can simply peak inside it: microsoftwindowsnetfx3ondemandpackagecab download free link
Wait for the progress bar to reach 100%. Once completed, you will see the message: "The operation completed successfully." Restart your computer to apply the changes. Troubleshooting Common NetFx3 Installation Errors Error Code 0x800F081F