1
Download and open NLGL
2
Click on RDR II
3
Select the game folder
Paste the game folder’s path in the Game folder field (How to open Steam game's folder?).
4
Click Install modules
5
Congrats!
If you’ve followed all of the steps correctly, you should be able to play Red Dead Redemption 2.
To play the game:
Open the Steam game’s folder, and click Launcher.exe (not RDR2Launcher.exe).