I am a demo user, trying to launch rFactor2 for the first time. I installed the launcher, and clicked singleplayer. When I click singleplayer, it comes up with a little screen in place for loading, as usual I presume. But, it only appears briefly before quickly changing back to the launcher. I've tried multiple times, but to no avail. I've also done a verification check, and it says everything is okay.
Try posting in the support section next time Click the cog icon on the left and try changing graphic settings, full screen or windowed, proper resolution etc. If that doesn't work you will need to provide details man. Driver, OS, GPU etc.
maybe you has downloaded the rfactor2 lite. If you have not bought the game you need download the demo: http://www.mediafire.com/download/qx8t7fdmfv3k9wk/rFactor2_DemoBuild_946.exe