Mozes ovako:
1.Back up "playgtav.exe" and "gtavlauncher.exe" and remove it from the directory.
2.Download the setup tool from rockstar and run it.
3.Choose "repair mode" and set the directory to the installed folder
4.After repair finishes you'll have the .EXEs you removed back, run "playgtav.exe" and login to social club. This will start an updates after which you will get your play button.