If you try to install .NET Framework 4.0.3 on a computer that already has .NET Framework 4.5, 4.6, 4.7, or 4.8 installed, you will likely see an error message stating: "You cannot install this version of the .NET Framework because a newer version is already installed."
For Windows 7 SP1 and Windows Server 2008 R2: .net framework v4.0.3.0319. download
. For security and performance, Microsoft recommends using the latest supported .NET Framework 4.8 How to Check if You Have It If you try to install
Navigate to: HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > NET Framework Setup > NDP > v4 > Full . or 4.8 installed