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The microsoft-windows-netfx3-ondemand-package.cab file is used to install on Windows 10/11 without an internet connection.
It sounds like you're looking for the file, which is used to manually install .NET Framework 3.5 on Windows 10 or Windows 11 (usually when the built-in "Features" installation fails). microsoftwindowsnetfx3ondemandpackagecab download free link
If you want, I can provide direct official Microsoft search terms you can paste to find the correct Microsoft Download Center or Update Catalog page. The microsoft-windows-netfx3-ondemand-package