As of my latest knowledge, there is no official .NET Framework 4.9 from Microsoft. The last major version released is .NET Framework 4.8, followed by 4.8.1.
If your application actually requires modern cross-platform .NET (e.g., .NET 8 or 9), you would need their respective desktop runtimes — but those are separate products, not “.NET Framework 4.9.” .NET Framework 4.9 Offline Installer for Windows
The .NET Framework 4.9 is a significant update to the .NET Framework, which includes many new features, improvements, and bug fixes. Some of the key features of .NET Framework 4.9 include: As of my latest knowledge, there is no official
Your immediate action plan: