Since 4.8.1 is the functional "last version" of the framework, here is the standard process for a clean installation:
Perfect for IT pros using SCCM or GPO to deploy to multiple machines. .NET Framework 4.9 Offline Installer for Windows
: You should only download official installers directly from the Microsoft .NET Download page to avoid potential malware bundled with fake "version 4.9" installers. Since 4
Look for the DWORD value. A successful installation will show a specific 6-digit release key corresponding to version 4.9. Method B: Via PowerShell .NET Framework 4.9 Offline Installer for Windows