Since "4.9" does not exist, you should download one of the following official Microsoft offline installers based on your actual needs: NET Framework 4.8.1
By understanding the real versioning, you avoid malware-ridden fake “4.9 installers” on third-party sites and ensure your Windows systems remain compatible with the latest enterprise applications. .NET Framework 4.9 Offline Installer for Windows
Add the /log parameter to capture detailed installation logs: Since "4
Since there is no "4.9" version, you should download the if you need to install it on a machine without internet access. Since "4.9" does not exist