A newer version (4.5, 4.6, or 4.8) is already installed. .NET Framework 4.0 is an in-place update for 4.5+? Actually no—4.5 replaces 4.0. If you have 4.5 or higher, you cannot install 4.0. But your legacy app will still usually work via compatibility.
Alternatively, check the registry:
Uninstall newer .NET versions (Control Panel → Programs and Features) temporarily, then install 4.0.30319, then reinstall the newer framework side-by-side (they do not conflict). Better: Use Application Compatibility Toolkit to force the app to run under 4.0. Net Framework 4.0 V 30319 Download Windows 7 64 Bit
: It introduced powerful tools like the Task Parallel Library (TPL) for multi-core processors and better debugging for 64-bit systems. Why People Still Look for It A newer version (4
If the official Microsoft link fails (Microsoft occasionally prunes old download pages), try these legal sources: If you have 4