the downloaded .exe file and select Run as administrator .
Yes! If you actually need .NET 9 (the cross-platform version), that does have an offline installer. You can download the .exe for Windows Desktop Runtime or SDK from: https://dotnet.microsoft.com/en-us/download/dotnet/9.0 But remember: .NET 9 is not .NET Framework 4.9. .NET Framework 4.9 Offline Installer for Windows
. As of early 2026, the .NET Framework lineage effectively ended with version 4.8.1 The "Version 4.9" Myth the downloaded