Determining if .NET framework is installed
When running the installer, the installer checks if .NET Framework 4.8 is installed. A message is displayed in the System Requirements section of the installer. This message lets you know if .NET Framework 4.8 is installed or not. If not, then you will have to manually refresh the installer UI in order to repeat the check. You can also rerun the installer since the .NET Framework 4.8 installation requires a reboot.
The Optiva System Information utility provides more details about the .NET Framework installation. The utility itself requires .NET Framework 4.8 to run.