Please make sure to have all of the requirements on the mod page before installing.
Drag and drop the "PepperBoxAutoCock.asi" file into your Red Dead Redemption 2 game directory.
Then drag and drop the "Pepper-Box Revolver" folder into your "lml" folder that is inside of your Red Dead Redemption 2 game directory.
If you encounter any issues with installing please leave a comment on the mod page and DO NOT message me on Discord.