Try this method : use OpenIV "mods" folder make a folder called "mods" inside GTA 5 folder copy the file which you want to modify eg "common.rpf" and paste it in mods folder now to install mods use the common.rpf inside "mods" folder to play online move that "mods" folder to desktop or any other folder now to play story mode with mods put it back to GTA 5 folder i hope this helped if you need more help just post over here i'll be ready to help.