.net Framework 4.9 Offline Installer For Windows |best| -

Use .NET Framework 4.8.1 . It remains supported as a component of the Windows OS.

Avoids installation interruptions caused by fluctuating network speeds. .NET Framework 4.9 Offline Installer for Windows

Once downloaded, you can install it on multiple machines without an active connection. .NET Framework 4.9 Offline Installer for Windows