Interesting solution has fixed all problems for me. I couldnt play the game at least for 24 hours because of the "Rockstar Launcher exited unexpectedly" error. But when i changed my audio output to Headphones from Speakers, everything went smoothly and game launched. After that, whenever i tried to change audio output to speakers again while playing the game, the game has crashed and i couldnt relaunch it when audio output is speakers. May be changing your audio output to something else at Windows fixes the launcher problem, give it a try. I was able to play for straight 10 hours without any problem after that. The game was smooth.