@arshish1612, sorry you've had trouble getting RealFlight 9.5S going. Hopefully this will help.
The normal activation process works for almost everybody. We have a backup method in place to catch the few who fail the first approach. However, past a certain recent date (I don't know it off the top of my head) that backup method needed an update to keep working and it hadn't been pushed out yet. So when the first method failed for you, unfortunately the second one was guaranteed to fail as well.
On Wednesday afternoon that update went out. You may not have received it yet, though. Much like, say, a phone company, Steam staggers update rollouts so they don't hit everyone everywhere at exactly the same time. You can ensure you're current though by exiting your Steam client all the way and restarting it. Note that It's not enough to just click the 'X' to close the Steam client; it will keep running in the background. If any updates are available, either for 9.5S or for any other titles you might own through Steam, it will see them after the restart.
Please try that and see if it gets you up and running.
All of the activation methods rely on our executables communicating with our server via port 80 (the standard HTTP port). If you're still experiencing a failure after the above, I recommend checking for anything that might be blocking that. The main method requires both RealFlightHelper.exe and RealFlightHelper_Admin.exe.
