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If you need a portable installer, you can use the official standalone installer package provided by Microsoft.
Because cybercriminals know people search for "offline installer." They wrap malware into fake installers. The official method (ISO + DISM) is the only secure route. If you need a portable installer, you can
Because the official Microsoft process is cumbersome, independent developers have created repackaged versions that aggregate the correct CAB files into a single, double-clickable EXE that works entirely offline. : Once the progress bar reaches 100%, you
To overcome these challenges, you can use the offline installer for .NET Framework 3.5. This installer allows you to install the framework manually, without requiring an active internet connection. without requiring an active internet connection.
: Once the progress bar reaches 100%, you can verify the installation in Turn Windows features on or off . Key Official Sources Install .NET Framework 3.5 on Windows 10 - Microsoft Learn