Pyfa Damage Simulation and Updating

I read that you could have Pyfa simulate the damage a ship takes when it orbits. I couldn’t figure out how to do that. Then I found out a ship I was simulating got nerfed. I went to update Pyra and then I found out I couldn’t figure out how to do that. Normally when getting a 3rd party app you just download an executable and run it and that executable creates the program. Here that doens’t seem to be the case when I try to update Pyfa and now I don’t know how I downloaded it in the first place. Screenshots would be appreciated.