I had the problem like many other guys that GTA V was working by itself, but when in RageMP a server was selected, in the Launching Game part Rockstar Launcher was opened and after 2 3 sec RageMP and Rockstar was closed and nothing else happened !! no error, no crash, no message, just simply closed!
Finally after trying many things like reinstall everything (even redownloaded 104 GB GTA V files!!!) I closed all open applications in background (like Razer App Engine, Razer Cortex, Google Sync, Inter Driver Updater and ,,,) then suddenly it worked and from that point I'm playing fine without any problem.
Just wanted to share my solution, maybe works for others too.