Oh really? XD
Yeah, try that. I hope you can play Redux in the next hours. Good luck!

Oh damn, sorry man...
I also thought I don't need that step with the backup in the mods folder. But as I recognized it worked for me this way. So I was thinking that the redux mod itself uses these files for the correct installation of redux... But I also have the Rockstar Game Version, not steam. Maybe that`s another point.
I really hope you can get your game back as you want. I'm just worried about the next updates from Rockstar... Because as it runs right now with redux everything is perfect. Don't ruin it, Rockstar!
(as I heard it isn't so easy to avoid these updates)

Greetings,
LazyDoubleD

Hello Jauz,

had this problem yesterday too. You mus be sure that you create the "mod"-folder correct with the files from the redux-installation-video.
I had the backup files in a special "backup" named folder inside the "mods" folder, and that was the reason. After that reinstall Redux with Open IV (be sure to get all the needed tools for it - AsiLoader in the menu). Then it should work!

Worked for me.
Have fun.