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If you try to open an older application, Windows will often prompt you with an error stating: "An app on your PC needs the following Windows feature: .NET Framework 3.5 (includes .NET 2.0 and 3.0)."
If successfully installed, the command line will output the exact version number of .NET Framework 3.5 running on your system.
/Source:X:\sources\sxs : Directs the installer to look inside the offline folder on your media instead of searching online. This public link is valid for 7 days
While the standard prompt asks you to download these files via Windows Update, this method frequently fails due to network restrictions, metered connections, or specific Windows Update errors (like 0x800F0906 , 0x800F0922 , or 0x800F081F ). This comprehensive guide provides to install .NET Framework 3.5 on Windows 10 and Windows 11 without requiring an active internet connection. Why Use an Offline Installer for .NET Framework 3.5?
) often fail or require an internet connection to "verify" the installation. Microsoft Learn
计算机无法从Windows Update下载所需文件，通常是组策略限制了更新源或者网络不可达。 Can’t copy the link right now
Microsoft provides a direct, trusted offline installer for .NET Framework 3.5 SP1.
Installing the .NET Framework 3.5 offline is a straightforward process, especially when using the DISM command-line tool with a Windows installation ISO. This ensures that your older applications and games run smoothly on Windows 10 and 11, regardless of your internet connectivity.
If prompted, select (requires internet) or point it to a local source file if your machine is fully offline. Troubleshooting Common Installation Errors their policies apply.
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How to Download .NET Framework 3.5 Offline Installer for Windows 10 & 11
This command uses the Deployment Image Servicing and Management (DISM) tool to install .NET Framework 3.5 directly from the local .cab source.