Use .NET Framework 4.8.1 . It remains supported as a component of the Windows OS.
The .NET Framework is a software development framework developed by Microsoft that provides a large library of pre-built functionality, security features, and a virtual execution environment for building a wide range of applications. The .NET Framework 4.9 is the latest version of the framework, released in August 2022, and it offers numerous improvements and new features. .NET Framework 4.9 Offline Installer for Windows
Install .NET Framework on Windows and Windows Server - Microsoft Learn released in August 2022