Hey u/X3X_Killer_X3X,
Could you go to the directory:C:\Program Files (x86)\Steam\steamapps\common\rocketleague\Binaries\Win32\
In there, hopefully, there will be a Launch.log file and a .dmp file as well.
Would you be able to upload these files to a file-sharing site like Google Drive and then DM me the link? We're looking into what may be causing some Rocket League not to launch for some players.
Thanks!