Check for .net 4.6 or greater

stub.cs

        private static bool CheckForDotnet46()
        {
            using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full\\"))
            {
                int releaseKey = Convert.ToInt32(ndpKey.GetValue("Release"));

                return (releaseKey >= 393295);
            }
        }

Use like this:

        if (!CheckForDotnet46())
        {
            _logger.Warn(".net 4.6 not detected. Please install .net 4.6 and try again.");
            return;
        }