To confirm you have the specific version installed:
For better security and stability, download the latest version from the Official .NET Framework Download Site Common Issues & Troubleshooting net framework 4.0 319 download
For environments without internet access, Microsoft provides a Standalone Installer Recommended Version: To confirm you have the specific version installed:
: A smaller initial file that automatically downloads only the components needed for your specific system architecture (x86 or x64) during the setup process. net framework 4.0 319 download